Allow comments in queries to contain characters after #

[smgallo]

Allow comments in queries to contain characters after #

Description

Comments in JSON files are defined as any key starting with "#". This enables the same behavior in ETL query definitions (previously only a "#" was allowed and not "# name" for example).

Motivation and Context

Improve ETL inline documentation and testing workflow.

Tests performed

Tested with "#" and "# name" as comments, verified results are correct.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project as found in the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.