chore: sync formating of rpc (exclude wallet rpc) code with Bitcoin Core

[knst]

Issue being fixed or feature implemented

Doing backports for any RPC-related is struggle, because at some points formatting of files got different; due to missing changes from bitcoin#14726, bitcoin#25029, bitcoin#17809 and multiple other occasions.

What was done?

Manually sync formatting with rpc/ code (exclude wallet) Bitcoin Core v25.99 (commit bbbf89a)

See also: #7130
These changes are split to 2 PR to reduce amount of conflicts and rebases in case of any backport are done due to huge diff size.

Hint: use 'ignore whitespace' feature to review this PR.

How Has This Been Tested?

On top of this PR finally succeed to backport bitcoin#24118 for which I had lots of troubles to resolve conflicts.

Breaking Changes

N/A

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation
• I have assigned this pull request to a milestone

[github-actions]

⚠️ Potential Merge Conflicts Detected

This PR has potential conflicts with the following open PRs:

• backport: bitcoin#24836, #25379, #25773, #25957, #25986, #26158, #26294, #26349, #26388, #26404, #26424, #26625, #26920, #27350 #7085 - backport: bitcoin#24836, #25379, #25773, #25957, #25986, #26158, #26294, #26349, #26388, #26404, #26424, #26625, #26920, #27350

Please coordinate with the authors of these PRs to avoid merge conflicts.

[coderabbitai]

Walkthrough

This pull request performs a large-scale reformatting and documentation update across eleven RPC definition files. Changes include rewrapping help text, converting example types from CLI to RPC format, expanding and standardizing RPCResult schemas, and restructuring argument and result documentation blocks within RPCHelpMan definitions. Two functional enhancements are introduced: a new echoipc RPC command in node.cpp that enables inter-process echo functionality, and an expanded getmemoryinfo RPC with additional memory statistics. All changes maintain backward compatibility with no modifications to function signatures or core logic.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately identifies the PR's main objective to sync RPC code formatting with Bitcoin Core, matching the primary change across multiple RPC files.
Description check	✅ Passed	The description is clearly related to the changeset, explaining the motivation (formatting divergence causing backport difficulties), what was done (manual sync with Bitcoin Core), and testing approach.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[UdjinM6]

utACK 1a49e0f