Implement AnyNode/AnyNodeRef for FStringFormatSpec

[dhruvmanila]

Summary

This PR adds the AnyNode and AnyNodeRef implementation for FStringFormatSpec node which will be required in the f-string formatting.

The main usage for this is so that we can pass in the node directly to suppressed_node in case debug expression is used to format is as verbatim text.

[github-actions]

ruff-ecosystem results

Linter (stable)

ℹ️ ecosystem check encountered linter errors. (no lint changes; 1 project error)

sphinx-doc/sphinx (error)

ruff failed
  Cause: Selection of unstable rules without the `--preview` flag is not allowed. Enable preview or remove selection of:
	- FURB113
	- FURB131
	- FURB132

Linter (preview)

✅ ecosystem check detected no linter changes.

Formatter (stable)

ℹ️ ecosystem check encountered format errors. (no format changes; 2 project errors)

sphinx-doc/sphinx (error)

ruff format --no-preview --exclude tests/roots/test-pycode/cp_1251_coded.py

ruff failed
  Cause: Selection of unstable rules without the `--preview` flag is not allowed. Enable preview or remove selection of:
	- FURB113
	- FURB131
	- FURB132

openai/openai-cookbook (error)

warning: Detected debug build without --no-cache.
error: Failed to parse examples/dalle/Image_generations_edits_and_variations_with_DALL-E.ipynb:3:7:8: Unexpected token 'prompt'

Formatter (preview)

ℹ️ ecosystem check encountered format errors. (no format changes; 1 project error)

openai/openai-cookbook (error)

ruff format --preview

warning: Detected debug build without --no-cache.
error: Failed to parse examples/dalle/Image_generations_edits_and_variations_with_DALL-E.ipynb:3:7:8: Unexpected token 'prompt'