feat(context): establish steward context

[bradcypert]

Establish context class, migrate container out of request and into context, replace request in route handlers and middleware with ocontext

BREAKING CHANGE: Handlers now take in a context instead of a request, Container classes broken into smaller more meaningful pieces

fixes #51

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (7c6e198) 72.72% compared to head (6e411d0) 71.68%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   72.72%   71.68%   -1.04%     
==========================================
  Files           8        9       +1     
  Lines         209      219      +10     
==========================================
+ Hits          152      157       +5     
- Misses         57       62       +5     

Files	Coverage Δ
lib/config/config_reader.dart	60.00% <100.00%> (ø)
lib/forms/forms.dart	100.00% <100.00%> (ø)
lib/router/request.dart	71.42% <100.00%> (-3.58%)	⬇️
lib/router/router.dart	91.25% <100.00%> (+0.34%)	⬆️
lib/router/static_binding.dart	66.66% <100.00%> (ø)
lib/container/container.dart	58.33% <50.00%> (ø)
lib/router/response.dart	71.11% <50.00%> (ø)
lib/app/app.dart	33.33% <33.33%> (ø)
lib/router/context.dart	37.50% <37.50%> (ø)

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.