feat: server_definitions Formats, Fields, and Flags

[ckeshava]

High Level Overview of Change

This PR adds the XLS specificaton document for enhancements to the server_definitions RPC. The content of this document is borrowed from #418 with a few modifications.

Section 3.2.1 has modificatons, as compared with the Discussion document.

Type of Change

• New XLS Draft
• XLS Update (changes to an existing XLS)
• XLS Status Change (e.g., Draft → Final, Draft → Stagnant)
• Process/Meta (changes to CONTRIBUTING.md, XLS-1, templates, etc.)
• Infrastructure (CI, workflows, scripts, website)
• Documentation (README updates, typo fixes)

[mvadari]

Please follow the process outlined in CONTRIBUTING.md.
Please also make the PR name more descriptive to this particular PR.

[github-actions]

🎫 XLS Number Assignment

This PR adds a new XLS draft. The next available XLS number has been determined:

Draft Directory	Assigned Number	New Directory Name
XLS-draft-server-definitions-enhancements	XLS-97	xls-0097-server-definitions-enhancements

Next Steps for XLS Editors

Before merging this PR, please:

1. Rename the directory from XLS-draft-server-definitions-enhancements to xls-0097-server-definitions-enhancements
2. Update the preamble in the README.md:
   • Set xls: to 97
   • Set status: to Draft

---

This comment was automatically generated. The XLS number is based on the highest existing number in the repository at the time this PR was opened.

[godexsoft]

Would be nice to update the example output file 👍

[mvadari]

@ckeshava bump

[mvadari]

LGTM, want @godexsoft to approve and the linter needs to be fixed before I'll approve

[godexsoft]

👍

[mvadari]

@ckeshava please resolve all comments