Numeric/text/misc fields

Problem/Motivation

Part 5 of splitting #3595219: 3.0 Exploration. This issue exposes a set of per-element configuration fields that are currently missing for numeric, text, container and a few simple element types, plus telephone submission handling. These are grouped because each is a small, independent field-exposure on an existing element type.

Missing fields in 3.x:

• Numeric (number, range): min, max, step, readonly, and the range output mode.
• Text (textfield, textarea, autocomplete): counter settings (count by character/word, limit, message) and input_hide.
• Color: colorSize.
• Details container: open.
• Containers (extending ContainerBase): randomize.
• Signature: readonly.
• Telephone (tel): the international/format fields, and submissions of phone numbers are not validated/accepted.

Proposed resolution

• Add a numeric interface exposing min / max / step (+ readonly) and a WebformRangeOutput enum for the range output mode.
• Expose counter settings via a webform_element_counter producer and a WebformCounterType enum, plus input_hide via a WebformDescriptionPlacement-style enum where relevant.
• Expose colorSize (with WebformColorSize enum), details open, container randomize and signature readonly.
• Expose tel fields (with WebformPhoneNumberFormat enum) and accept/validate phone-number submissions in WebformSubmit.php.

Remaining tasks

• Add enums WebformRangeOutput, WebformCounterType, WebformColorSize, WebformPhoneNumberFormat, WebformDescriptionPlacement under src/Enum/; wire into WebformSchemaBuilder.php.
• Add src/Plugin/GraphQL/DataProducer/WebformElementCounter.php; extend WebformElementMetadata.php / WebformElementProperty.php for the new fields.
• Register the new fields/interfaces in WebformExtension.php.
• Validate phone-number submissions in WebformSubmit.php.
• Tests: NumericFieldsTest, NumericBaseExtrasTest, CounterTest, InputHideTest, ColorTest, DetailsTest, FlexboxTest, SignatureTest, TextFieldTest, TelTest, FormSubmissionTelephoneValidationTest, plus the matching tests/queries/*.gql fixtures and shared test-form additions.

API changes

Additive: new fields on numeric / text / color / details / container / signature / tel elements, several new enums, and telephone submission validation. No fields removed.

Release notes snippet

Numeric, text, color, details, container, signature and telephone elements now expose their relevant configuration (min/max/step, readonly, counters, input hiding, color size, details open, container randomize, phone format), and telephone submissions are validated.