add tql pragma for log-level sql-thread-lock

[OutOfBedlam]

This pull request introduces several enhancements and refactoring changes across multiple files, focusing on adding experimental features, improving regex usage, and adding new functionality. The most important changes include the introduction of the LockOSThread feature, refactoring regex usage, and adding a new Vector type in the nums package.

Experimental Features:

• api/commands.go: Added LockOSThread field to CommandHandler struct and updated runSql method to set this field in the Query object. [1] [2]
• api/do_query.go: Added lockOSThread field to Query struct and implemented SetLockOSThread method. Modified Execute method to lock the OS thread if lockOSThread is set. [1] [2] [3] [4] [5]

Regex Refactoring:

• api/commands.go: Replaced inline regex compilation with precompiled regex variables for parseCommandLineRegex and explainFullRegex. [1] [2] [3]
• api/options.go: Refactored SqlTidyWidth function to use a precompiled regex variable sqlTidyWidthRegexp.
• mods/server/http.go: Refactored handleMarkdown method to use precompiled regex variables mdFileRootRegexp, mdFilePathRegexp, mdFileNameRegexp, and mdFileDirRegexp. [1] [2]

New Functionality:

• mods/nums/vectors.go: Added a new Vector type with methods for dimension calculation, JSON marshaling/unmarshaling, and binary marshaling/unmarshaling.
• mods/nums/vectors_test.go: Added tests for the new Vector type, covering various methods and functionalities.

Miscellaneous Improvements:

• magefiles/magefile.go: Added debug build tags for Linux targets when the strip flag is not set.
• mods/server/http_opts.go: Added a new WithHttpKeepAlive option to configure the keep-alive period for HTTP connections.

These changes improve the codebase by adding new features, optimizing performance, and enhancing maintainability.

[codecov]

Codecov Report

Attention: Patch coverage is 58.70445% with 102 lines in your changes missing coverage. Please review.

Project coverage is 41.14%. Comparing base (b61cde6) to head (11f913b).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
mods/server/svrmetric.go	0.00%	28 Missing ⚠️
mods/nums/vectors.go	85.45%	12 Missing and 4 partials ⚠️
mods/tql/task.go	48.14%	12 Missing and 2 partials ⚠️
mods/tql/task_node.go	15.38%	10 Missing and 1 partial ⚠️
api/metrics.go	0.00%	9 Missing ⚠️
mods/server/http_query.go	28.57%	4 Missing and 1 partial ⚠️
mods/server/http.go	50.00%	3 Missing and 1 partial ⚠️
mods/server/http_opts.go	0.00%	4 Missing ⚠️
mods/tql/fm_dbsrc.go	40.00%	2 Missing and 1 partial ⚠️
api/do_query.go	80.00%	1 Missing and 1 partial ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #297      +/-   ##
==========================================
+ Coverage   40.52%   41.14%   +0.61%     
==========================================
  Files         261      259       -2     
  Lines       57400    56864     -536     
==========================================
+ Hits        23262    23394     +132     
+ Misses      31800    31129     -671     
- Partials     2338     2341       +3     

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