[DO NOT MERGE] POC of sql commenter with text attributes propagator

[XSAM]

This PR is a prototype to demonstrate SQL commenter with the text attributes propagator.

This is the instrumentation API to enable SQL commenter: https://github.com/XSAM/otelsql/pull/512/files#diff-086a37ef11c8fd9a2516991339db79c207741ac98dd89c8215d31a8bead2814fR94

This is an example of usage: https://github.com/XSAM/otelsql/pull/512/files#diff-65caf616dc77b09c44c1fc0eba33369464655b1318bdedb0051351b635ebf881R138-R141

Steps to run the example:

• Go to example/sql-commenter folder
• docker compose up -d This runs a sql server, otel collector, and sql client.
• docker compose up client to run a query from sql client. Meanwhile,
• run this query against sql server database to fetch query samples (queries that are currently running)

SELECT Substring(o.text, ( r.statement_start_offset / 2 ) + 1,
                 ( ( CASE r.statement_end_offset
                         WHEN -1 THEN Datalength(o.text)
                         ELSE r.statement_end_offset
                         END -
                     r.statement_start_offset ) / 2 ) + 1)          AS statement_text,
       o.text                                         AS text,
       Isnull(r.context_info, CONVERT(VARBINARY, '')) AS context_info
FROM   sys.dm_exec_requests r
           INNER JOIN sys.dm_exec_sessions s
                      ON r.session_id = s.session_id
           INNER JOIN sys.dm_exec_connections c
                      ON s.session_id = c.session_id
           CROSS apply sys.dm_exec_sql_text(r.plan_handle) AS o

Example results:

statement_text	text	context_info
WAITFOR DELAY '00:00:05' /*service.name='otelsql-example',traceparent='00-13ca090ee3e5b732879841a494b4dd45-b5ad38f303f1f181-01'*/	SELECT * FROM sys.dm_exec_connections; WAITFOR DELAY '00:00:05' /*service.name='otelsql-example',traceparent='00-13ca090ee3e5b732879841a494b4dd45-b5ad38f303f1f181-01'*/

You could remove TraceContext propagator here, https://github.com/XSAM/otelsql/pull/512/files#diff-65caf616dc77b09c44c1fc0eba33369464655b1318bdedb0051351b635ebf881R140. Then, you will get a query like this

WAITFOR DELAY '00:00:05' /*service.name='otelsql-example'*/

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.2%. Comparing base (925d512) to head (ab10fc6).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
attributes_propagator.go	0.0%	16 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #512     +/-   ##
=======================================
- Coverage   85.6%   84.2%   -1.4%     
=======================================
  Files         16      17      +1     
  Lines        925     945     +20     
=======================================
+ Hits         792     796      +4     
- Misses       107     123     +16     
  Partials      26      26             

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