enhance: syntax highlighting for json/yaml

[plyr4]

implemented using https://github.com/alecthomas/chroma v2

adds a couple flags:

• VELA_COLOR - enable/disable color
• VELA_COLOR_FORMAT - sets the formatter (terminal, terminal256, etc, see chroma)
• VELA_COLOR_THEME - sets the color theme (monokai, onedark, etc, see chroma)

putting this out early to get some feedback but i still need to add some tests and better user flag options etc

json - monokai theme

yaml - nord theme

[codecov]

Codecov Report

Attention: Patch coverage is 70.22222% with 67 lines in your changes missing coverage. Please review.

Project coverage is 78.88%. Comparing base (88582e2) to head (04308e4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #558      +/-   ##
==========================================
- Coverage   79.90%   78.88%   -1.03%     
==========================================
  Files         161      162       +1     
  Lines        3982     4106     +124     
==========================================
+ Hits         3182     3239      +57     
- Misses        581      632      +51     
- Partials      219      235      +16     

Files	Coverage Δ
action/build/cancel.go	100.00% <100.00%> (ø)
action/build/get.go	93.10% <100.00%> (ø)
action/build/restart.go	100.00% <100.00%> (ø)
action/build/view.go	100.00% <100.00%> (ø)
action/config/generate.go	90.47% <100.00%> (+0.73%)	⬆️
action/deployment/add.go	91.30% <100.00%> (ø)
action/deployment/get.go	90.90% <100.00%> (ø)
action/deployment/view.go	100.00% <100.00%> (ø)
action/hook/get.go	81.81% <100.00%> (ø)
action/hook/view.go	100.00% <100.00%> (ø)
... and 89 more

[wsan3]

LGTM