feat: add databaseMirroringPartner event handler

[nick-w-nick]

This PR is to fix #1669, where the library throws an unhandled exception if it encounters an ENVCHANGE event of type DATABASE_MIRRORING_PARTNER.

This behavior isn't explicitly documented, but there have been a few issues brought up regarding this functionality in the past, and it has been stated that tedious does not plan to support failover partners. While that may be the case, this event being emitted by SQL Server is causing Tedious to crash completely rather than simply ignoring it as you would expect.

The changes in this PR are to create the databaseMirroringPartner event emitter and register the necessary handler methods in the associated token handler classes, to prevent the default behavior of throwing an Unexpected token error.

To clarify, this does not implement mirroring functionality or anything of the sort, it simply updates the default behavior to allow the event to pass through and be ignored, rather than unnecessarily throwing an unhandled exception.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.80%. Comparing base (fc288ed) to head (7579731).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/token/handler.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1671      +/-   ##
==========================================
- Coverage   78.82%   78.80%   -0.02%     
==========================================
  Files          90       90              
  Lines        4887     4888       +1     
  Branches      920      920              
==========================================
  Hits         3852     3852              
- Misses        736      737       +1     
  Partials      299      299              

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[nick-w-nick]

@arthurschreiber Just curious if this can be merged anytime soon?

I am still using a custom fork of this package to support my MSSQL connections, and would greatly appreciate being able to switch back to the official version once this is merged in.

Let me know if you need any changes to the PR in order to proceed.

Thanks!

[nick-w-nick]

@arthurschreiber Is it possible to get this PR merged sometime in the near future?

We have been maintaining a fork of tedious while waiting on this PR to be merged, and would appreciate being able to swap back to the official version.

[nick-w-nick]

@arthurschreiber Checking in again as to if this can be merged anytime soon, I am still required to use a custom fork of tedious for my MSSQL projects due to this fix not yet being merged into master.

Let me know if I can provide any assistance.

Thanks!

[github-actions]

🎉 This PR is included in version 19.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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