V1 private api

[BrianMichell]

This PR should remain a draft until #553 is reviewed and approved/rejected.

Fully addresses

• DIY Factory Builder
  Begins to add some documentation for the builder.
• JSON Serialization

Partially addresses

• Template Factory

[codecov]

Codecov Report

Attention: Patch coverage is 90.65041% with 92 lines in your changes missing coverage. Please review.

Project coverage is 91.54%. Comparing base (0195bb1) to head (006f614).
Report is 147 commits behind head on v1.

Files with missing lines	Patch %	Lines
src/mdio/core/v1/_serializer.py	69.93%	31 Missing and 12 partials ⚠️
src/mdio/core/v1/factory.py	71.01%	19 Missing and 1 partial ⚠️
tests/unit/test_schema.py	95.51%	3 Missing and 8 partials ⚠️
src/mdio/core/v1/_overloads.py	74.28%	8 Missing and 1 partial ⚠️
src/mdio/core/v1/builder.py	94.11%	5 Missing and 2 partials ⚠️
src/mdio/schemas/core.py	94.11%	0 Missing and 1 partial ⚠️
tests/integration/test_v1_serialization.py	97.56%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v1     #557      +/-   ##
==========================================
+ Coverage   84.32%   91.54%   +7.22%     
==========================================
  Files          46       70      +24     
  Lines        2194     3937    +1743     
  Branches      305      273      -32     
==========================================
+ Hits         1850     3604    +1754     
+ Misses        301      258      -43     
- Partials       43       75      +32     

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[BrianMichell]

I think this is fine to start pushing forward @tasansal