Add support for orjson

[seandstewart]

This change reworks our tojson factory logic and adds support for the orjson library (resolves #77)

Also -

• Provide the always parameter to typic.klass (resolves #177)
• Allow callable classes to be treated as functions in protocols() (resolves #173, supersedes #176)

[codecov[bot]]

Codecov Report

Merging #178 (1e1ff31) into main (93d4ee6) will increase coverage by 0.03%. The diff coverage is 94.73%.

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
+ Coverage   94.98%   95.01%   +0.03%     
==========================================
  Files          37       37              
  Lines        4125     4150      +25     
  Branches      575      577       +2     
==========================================
+ Hits         3918     3943      +25     
  Misses        128      128              
  Partials       79       79              

Flag	Coverage Δ
unittests	94.89% <94.73%> (+0.03%)	:arrow_up:

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Impacted Files	Coverage Δ
typic/klass.py	100.00% <ø> (ø)
typic/serde/resolver.py	94.11% <50.00%> (-0.03%)	:arrow_down:
typic/env.py	76.00% <75.00%> (-1.09%)	:arrow_down:
typic/__init__.py	100.00% <100.00%> (ø)
typic/api.py	96.20% <100.00%> (+0.51%)	:arrow_up:
typic/ext/json.py	100.00% <100.00%> (ø)
typic/ext/schema/field.py	99.28% <100.00%> (ø)

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