Add support for MSSQL

[justusdieckmann]

Hey everyone,

this PR adds support for MSSQL (Fixes #92)

I tested it with our plugin tool_lifecycle here. The errors in the first commit are correct, since we used some MSSQL-incompatible syntax in the plugin. Those were addressed in the next two commits.

Justus

[justusdieckmann]

Sadly, there is no good way around the need for a password for the database with the official docker image, so I passed that to moodle-plugin-ci install only if matrix.database == 'sqlsrv'.

I have not looked into the .travis.dist.yml yet, since I am much more familiar with github actions.

Also, in the gha.dist.yml, I have completely replaced the ${{ matrix.extensions }} with sqlsrv, since extensions wasn't set anywhere.

I would be glad for any comments and opinions! :)

[codecov]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.25%. Comparing base (783ec09) to head (0ddd3c9).
Report is 20 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Installer/Database/MSSQLDatabase.php	93.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #302      +/-   ##
============================================
+ Coverage     88.22%   88.25%   +0.03%     
- Complexity      734      738       +4     
============================================
  Files            76       77       +1     
  Lines          2267     2282      +15     
============================================
+ Hits           2000     2014      +14     
- Misses          267      268       +1     

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