Add new Stage construct

[timkpaine]

No description provided.

[github-actions]

Test Results

664 tests  +36   656 ✅ +36   7m 24s ⏱️ +10s
  1 suites ± 0     8 💤 ± 0 
  1 files   ± 0     0 ❌ ± 0 

Results for commit 389b938. ± Comparison against base commit e44bc09.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 84.13408% with 142 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.07%. Comparing base (e44bc09) to head (389b938).

Files with missing lines	Patch %	Lines
csp_gateway/client/client.py	24.13%	88 Missing ⚠️
csp_gateway/server/web/routes/stage.py	79.06%	18 Missing ⚠️
csp_gateway/server/gateway/csp/channels.py	83.33%	13 Missing ⚠️
csp_gateway/server/gateway/csp/stage.py	91.21%	13 Missing ⚠️
csp_gateway/tests/server/gateway/csp/test_stage.py	97.36%	9 Missing ⚠️
csp_gateway/server/gateway/csp/state.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3     #280      +/-   ##
==========================================
- Coverage   87.24%   87.07%   -0.17%     
==========================================
  Files         142      146       +4     
  Lines       14572    15459     +887     
==========================================
+ Hits        12713    13461     +748     
- Misses       1859     1998     +139     

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