Basic layout persistence implementation.

[fhubi]

As we discussed, the shell will decide how it would like to serialize and deserialize layout data and the layout data is also depends on the shell.

• Added the necessary interfaces
• Added FileLayoutPersistance
• Added json and xml serializer/deserializer

[codecov]

Codecov Report

Attention: Patch coverage is 84.37500% with 10 lines in your changes missing coverage. Please review.

Project coverage is 67.78%. Comparing base (dd3817e) to head (04259c3).
Report is 28 commits behind head on main.

Files with missing lines	Patch %	Lines
...outPersistence/Serializers/JsonLayoutSerializer.cs	71.42%	2 Missing and 2 partials ⚠️
...youtPersistence/Serializers/XmlLayoutSerializer.cs	78.94%	2 Missing and 2 partials ⚠️
...mposeUI.LayoutPersistence/FileLayoutPersistence.cs	93.54%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #755      +/-   ##
==========================================
+ Coverage   67.63%   67.78%   +0.14%     
==========================================
  Files         261      264       +3     
  Lines        7997     8061      +64     
  Branches      894      858      -36     
==========================================
+ Hits         5409     5464      +55     
- Misses       2400     2405       +5     
- Partials      188      192       +4     

Files with missing lines	Coverage Δ
...mposeUI.LayoutPersistence/FileLayoutPersistence.cs	93.54% <93.54%> (ø)
...outPersistence/Serializers/JsonLayoutSerializer.cs	71.42% <71.42%> (ø)
...youtPersistence/Serializers/XmlLayoutSerializer.cs	78.94% <78.94%> (ø)

... and 1 file with indirect coverage changes