### Does this PR have any customer impact?
No
### Type (Feature, Refactoring, Bugfix, DevOps, Testing, Perf, etc)
Docs
### Does it involve schema level changes? (Table, Column, Index, UDF, etc level changes)
No
### Are you introducing any new config? If yes, do you have tests with and without them being set?
No
### Release Note (Refer [Template](../docs/release_notes/pgmongo_template.md))
### Description
This PR includes updates to add base Doxygen comments within SQL files, setting up initial documentation structure for functions. Additionally, it includes Doxygen configuration files (Doxyfile, etc.) tailored to support SQL file parsing and documentation generation.
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#### AI description (iteration 1)
#### PR Classification
Documentation
#### PR Summary
This pull request adds Doxygen comments to various `helio_api` functions to improve code documentation.
- Added Doxygen comments to functions in `sql/udfs/commands_crud/query_cursors_single_page--latest.sql`
- Added Doxygen comments to functions in `sql/udfs/utils/extension_version_utils--latest.sql`
- Added Doxygen comments to functions in `sql/udfs/auth/auth_scram--latest.sql`
- Added Doxygen comments to functions in `sql/udfs/commands_crud/delete--latest.sql`
- Added Doxygen comments to functions in `sql/udfs/schema_mgmt/create_collection_view--latest.sql`
Guanzhou Song
Vinod Sridharan
Sena Gungor