Summary of Changes

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This pull request resolves a critical issue where the object_metadata_parser could cause a process crash when encountering a type mismatch for string fields in JSON, such as an integer being provided where a string was expected. The changes introduce a new, robust helper function, internal::ParseStringField, which gracefully handles these type mismatches by returning a google::cloud::Status error. This helper is then integrated into the object_metadata_parser for all relevant string fields, significantly improving the stability and error reporting of the metadata parsing logic.

Highlights

• Robust String Field Parsing: Introduced internal::ParseStringField to safely parse string fields from JSON, returning a Status on type mismatch instead of causing a process crash.
• Enhanced Object Metadata Parsing: Updated object_metadata_parser to utilize the new ParseStringField helper for various string fields, significantly improving error handling and preventing crashes due to type mismatches.
• Metadata Value Validation: Added explicit validation within the ParseMetadata function to ensure that all values within the 'metadata' map are indeed strings, returning an InvalidArgumentError if not.
• Comprehensive Unit Tests: Included new unit tests for ParseStringField to cover successful parsing, handling of missing fields, and proper error reporting for invalid field types (e.g., integers or arrays where strings are expected).

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