WIP: Tag system + Version System

[VarLad]

This PR attempts to add tag system + versioning system to PerfChecker.

[VarLad]

Whats left:

• Tracking head
• Introduce a way for users to provide package name + versions upon which we resolve the version and run these tests. (Preferably via the same dict as the rest of stuff)
• Create temporary environments for users that provide package names and versions.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 58.33%. Comparing base (eb188fd) to head (07447d1).

Files	Patch %	Lines
src/versions.jl	0.00%	33 Missing ⚠️
src/PerfChecker.jl	94.44%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              dev      #25       +/-   ##
===========================================
- Coverage   88.88%   58.33%   -30.56%     
===========================================
  Files           5        6        +1     
  Lines          45       96       +51     
===========================================
+ Hits           40       56       +16     
- Misses          5       40       +35     

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[VarLad]

Todo:

• Add an example which deals with testing multiple versions of the same package.
• Deal with head. The only reason I haven't done it is because I feel like users can just easily provide it inside the extra_pkgs key in the config dictionary.

On the next episode PR:

• Convert the entire "Config Result" into a (TOML?) file and the ability to parse results from a (TOML?) file.

[Azzaare]

Nightly issue is related to some Pkg changes. We probably should not try to fix it before any v11-alpha/beta is out anyway.