feat: deployment config for expected params and targets

[ecrupper]

Additional context: go-vela/community#1002

This change will allow for the deployment block in Vela pipeline files:

version: "1"

deployment:
    targets: [ dev, stage, prod ]
    parameters:
        foo:
            description: blah
            required: true
            type: string

These configurations can also be templated using the standard template format already existing today in Vela:

version: "1"

templates:
    - name: my-deploy-config
       source: over-there.yml
       type: file

deployment:
    template:
        name: my-deploy-config
        vars:
            regions: [ north, east, west ]

Deployment configurations can also be requested using the new API endpoint:

GET /api/v1/deployments/:org/:repo/config

This will allow for the CLI and UI to validate deployments prior to their launch. However, because you can create deployments in other ways outside the scope of Vela, and Vela still will process the resulting webhook, this PR also validates the incoming deployment against the config and will stop the compilation if there's a mismatch.

[codecov]

Codecov Report

Attention: Patch coverage is 51.19617% with 102 lines in your changes missing coverage. Please review.

Project coverage is 56.84%. Comparing base (f463fc9) to head (9a8884c).

Files with missing lines	Patch %	Lines
api/deployment/get_config.go	0.00%	56 Missing ⚠️
compiler/native/expand.go	50.00%	14 Missing and 4 partials ⚠️
api/webhook/post.go	0.00%	8 Missing ⚠️
api/build/compile_publish.go	0.00%	6 Missing ⚠️
compiler/native/compile.go	33.33%	4 Missing and 2 partials ⚠️
compiler/types/pipeline/deployment.go	89.28%	4 Missing and 2 partials ⚠️
api/deployment/get.go	0.00%	1 Missing ⚠️
router/deployment.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1214      +/-   ##
==========================================
- Coverage   56.87%   56.84%   -0.04%     
==========================================
  Files         599      602       +3     
  Lines       32856    33050     +194     
==========================================
+ Hits        18687    18787     +100     
- Misses      13535    13621      +86     
- Partials      634      642       +8     

Files with missing lines	Coverage Δ
compiler/native/transform.go	95.38% <100.00%> (+0.03%)	⬆️
compiler/template/native/render.go	86.95% <100.00%> (ø)
compiler/types/pipeline/build.go	72.72% <ø> (ø)
compiler/types/yaml/build.go	91.04% <100.00%> (+0.27%)	⬆️
compiler/types/yaml/deployment.go	100.00% <100.00%> (ø)
scm/github/webhook.go	90.12% <100.00%> (+0.04%)	⬆️
api/deployment/get.go	0.00% <0.00%> (ø)
router/deployment.go	0.00% <0.00%> (ø)
api/build/compile_publish.go	0.00% <0.00%> (ø)
compiler/native/compile.go	69.56% <33.33%> (-0.81%)	⬇️
... and 4 more