[DOCS] Add SQL operation summaries

[lcawl]

Relates to #2635

Adds summaries to https://www.elastic.co/docs/api/doc/elasticsearch-serverless/group/endpoint-sql based on https://www.elastic.co/guide/en/elasticsearch/reference/current/sql-apis.html

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
sql.clear_cursor	🟢	1/1	1/1
sql.delete_async	⚪	Missing test	Missing test
sql.get_async_status	⚪	Missing test	Missing test
sql.get_async	⚪	Missing test	Missing test
sql.query	🟢	4/4	4/4
sql.translate	🔴	1/1	0/1

You can validate these APIs yourself by using the make validate target.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
sql.clear_cursor	🟢	1/1	1/1
sql.delete_async	⚪	Missing test	Missing test
sql.get_async_status	⚪	Missing test	Missing test
sql.get_async	⚪	Missing test	Missing test
sql.query	🟢	4/4	4/4
sql.translate	🔴	1/1	0/1

You can validate these APIs yourself by using the make validate target.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
sql.clear_cursor	🟢	1/1	1/1
sql.delete_async	⚪	Missing test	Missing test
sql.get_async_status	⚪	Missing test	Missing test
sql.get_async	⚪	Missing test	Missing test
sql.query	🟢	4/4	4/4
sql.translate	🔴	1/1	0/1

You can validate these APIs yourself by using the make validate target.

[marciw]

Minor style quibble to consider but LGTM 👍