Added: Base Implementation of AdvancedInstaller Core

[Sewer56]

This PR implements the core/base of AdvancedInstaller; checklist and more details available here:

• Implement Base Advanced Installer Design #635

The only thing not done is the mechanism that causes AdvancedInstaller to be invoked.

The AdvancedInstaller IModInstaller is currently a stub. We decided that we still need to discuss with design how the Advanced Installer is to be invoked (e.g. should it be invoked if all other installers don't perform an operation? Should we prompt the user? etc.).

Thus the activation logic is not included in this PR.

[codecov]

Codecov Report

Merging #657 (842dc5a) into main (03a3480) will increase coverage by 0.00%.
The diff coverage is 73.23%.

@@           Coverage Diff           @@
##             main     #657   +/-   ##
=======================================
  Coverage   64.04%   64.05%           
=======================================
  Files         617      622    +5     
  Lines       17401    17472   +71     
  Branches     1115     1120    +5     
=======================================
+ Hits        11144    11191   +47     
- Misses       5978     6002   +24     
  Partials      279      279           

Flag	Coverage Δ
Linux	63.36% <73.23%> (+0.10%)	⬆️
Windows	63.24% <73.23%> (-0.01%)	⬇️
clean_environment_tests	64.03% <73.23%> (+<0.01%)	⬆️
network_tests	?

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

Files Changed	Coverage
...sMods.Games.AdvancedInstaller/AdvancedInstaller.cs	0.00%
...vancedInstaller/Exceptions/MappingAlreadyExists.cs	66.66%
...exusMods.Games.AdvancedInstaller/DeploymentData.cs	94.44%
...ames.AdvancedInstaller/DeploymentDataExtensions.cs	100.00%
.../NexusMods.Games.AdvancedInstaller/ThrowHelpers.cs	100.00%