Coding standards update (use statements and nullables)

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FOUND 1 ERROR AFFECTING 1 LINE
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 107 | ERROR | [x] Parameter $account has null default value, but is not marked
     |       |     as nullable.
     |       |     (SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue.NullabilityTypeMissing)
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...pc/web/modules/custom/jsonrpc/src/ParameterFactory/RawParameterFactory.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 36 | ERROR | [x] Parameter $context has null default value, but is not marked
    |       |     as nullable.
    |       |     (SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue.NullabilityTypeMissing)
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...modules/custom/jsonrpc/src/ParameterFactory/PaginationParameterFactory.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 46 | ERROR | [x] Parameter $context has null default value, but is not marked
    |       |     as nullable.
    |       |     (SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue.NullabilityTypeMissing)
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...web/modules/custom/jsonrpc/src/ParameterFactory/EntityParameterFactory.php
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FOUND 2 ERRORS AFFECTING 2 LINES
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 59 | ERROR | [x] Parameter $parameter_definition has null default value, but
    |       |     is not marked as nullable.
    |       |     (SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue.NullabilityTypeMissing)
 79 | ERROR | [x] Parameter $context has null default value, but is not marked
    |       |     as nullable.
    |       |     (SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue.NullabilityTypeMissing)
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PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...s/project/jsonrpc/web/modules/custom/jsonrpc/src/JsonRpcObject/Request.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 61 | ERROR | [x] Parameter $params has null default value, but is not marked
    |       |     as nullable.
    |       |     (SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue.NullabilityTypeMissing)
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...lds/project/jsonrpc/web/modules/custom/jsonrpc/src/JsonRpcObject/Error.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 84 | ERROR | [x] Parameter $cacheability has null default value, but is not
    |       |     marked as nullable.
    |       |     (SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue.NullabilityTypeMissing)
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: .../project/jsonrpc/web/modules/custom/jsonrpc/src/Exception/ErrorHandler.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 8 | ERROR | [x] Use statements should be sorted alphabetically. The first
   |       |     wrong one is Psr\Log\LogLevel.
   |       |     (SlevomatCodingStandard.Namespaces.AlphabeticallySortedUses.IncorrectlyOrderedUses)
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...roject/jsonrpc/web/modules/custom/jsonrpc/src/Annotation/JsonRpcMethod.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 128 | ERROR | [x] Parameter $account has null default value, but is not marked
     |       |     as nullable.
     |       |     (SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue.NullabilityTypeMissing)
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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