Add structured logging stacktrace hash field

[GollapudiSrikanth]

Summary

This PR adds support for emitting the stacktrace hash as a separate structured logging field, in addition to the existing inline format.

Details

Currently, when logging.structured.json.stacktrace.include-hashes is enabled, the hash is prefixed inline within the stack_trace field. While this is useful, it makes it harder to filter and group logs based on the hash value.

This change introduces new configuration properties:

logging.structured.stacktrace.hash.generate=inline | as-field
logging.structured.stacktrace.hash.field-name=stack_trace_hash

• inline preserves the existing behavior (default for backward compatibility)
• as-field emits the hash as a separate structured field
• field-name allows customization of the output field name

Backward Compatibility

• The existing property logging.structured.json.stacktrace.include-hashes is still supported in a deprecated form
• When set, it maps to the equivalent inline behavior
• The new properties take precedence if both are configured

Example

With:

logging.structured.stacktrace.hash.generate=as-field

Output:

{
  "stack_trace": "...",
  "stack_trace_hash": "351b6441"
}

Testing

• Added tests for:
• Inline mode (existing behavior)
• As-field mode
• Custom field name
• Deprecated property compatibility and precedence

Related Issue

Closes #49639