Added MySQL HealthChecks Query and Callback support.

[turric4n]

What this PR does / why we need it:

It improves MySql Health Checks by adding Query and Callback Support.

Which issue(s) this PR fixes:

Please reference the issue this PR will close: #[issue number]

Special notes for your reviewer:

I tried to do my best mantaining original code structure.

Does this PR introduce a user-facing change?:

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [V ] Code compiles correctly
• [ V] Created/updated tests
• [ V] Unit tests passing
• [ V] End-to-end tests passing
• [ V] Extended the documentation
• [V ] Provided sample for the feature

[turric4n]

@dotnet-policy-service agree [company="{your company}"]

[turric4n]

@dotnet-policy-service agree

[turric4n]

I can become project contributor if it necessary.

[turric4n]

Right!

[sungam3r]

@turric4n You also need to update API approval file. Just run test locally and replace old file with the new one.

[cieciurm]

Hi @turric4n,

Are you planning to finish up this PR this week?
I see there is very small changes required. Perhaps you could make it? 😄

[turric4n]

Indeed, I will.

[turric4n]

@sungam3r @cieciurm I'm passing the tests locally. What should I do now?

[turric4n]

Done! I believe I've accounted for everything.

[sungam3r]

https://github.com/Xabaril/AspNetCore.Diagnostics.HealthChecks/pull/1835/files#r1250440967

[codecov-commenter]

Codecov Report

Merging #1835 (4de4788) into master (5325c5d) will increase coverage by 0.12%.
The diff coverage is 94.73%.

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@@            Coverage Diff             @@
##           master    #1835      +/-   ##
==========================================
+ Coverage   66.98%   67.10%   +0.12%     
==========================================
  Files         212      213       +1     
  Lines        7744     7776      +32     
  Branches      527      529       +2     
==========================================
+ Hits         5187     5218      +31     
  Misses       2422     2422              
- Partials      135      136       +1     

Flag	Coverage Δ
MySql	33.53% <94.73%> (+15.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/HealthChecks.MySql/MySqlHealthCheck.cs	90.47% <81.81%> (-2.86%)	⬇️
...encyInjection/MySqlHealthCheckBuilderExtensions.cs	100.00% <100.00%> (ø)
src/HealthChecks.MySql/MySqlHealthCheckOptions.cs	100.00% <100.00%> (ø)

[sungam3r]

Thanks, @turric4n.

[turric4n]

Thanks to you all, and sorry for the inconveniences.