Return type declarations [#3455441]

Problem/Motivation

Functions and methods lack clear return type declarations, causing potential type-related errors in the codebase.

Proposed resolution

Add explicit return type declarations to functions and methods to define expected return types clearly. This change improves code clarity, reduces ambiguity, and helps prevent type-related errors.

Issue fork node_read_time-3455441

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3455441-return-type-declarations changes, plain diff MR !23
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