Add URL parsing to CEL expressions.

[bigkevmcd]

Changes

This adds a new function parseURL to the CEL expression library.

This will act on a string, and parse it into a map which can be accessed from the remainder of the expression.

For example, 'https://example.com/testing#test'.parseURL().fragment == 'test'

Submitter Checklist

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• Includes tests (if functionality changed/added)
• Includes docs (if user facing)
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Release Notes

Add URL parsing to CEL expressions.
    
This adds a new function `parseURL` to the CEL expression library.
    
This will act on a string, and parse it into a map which can be accessed from the remainder of the expression.
    
For example, 'https://example.com/testing#test'.parseURL().fragment == 'test'

This addresses #590

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/interceptors/cel/triggers.go	87.1%	87.2%	0.1
pkg/template/cel/cel.go	Do not exist	76.3%

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/interceptors/cel/triggers.go	87.1%	87.2%	0.1

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/interceptors/cel/triggers.go	87.1%	87.2%	0.1

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/interceptors/cel/triggers.go	87.1%	87.2%	0.1

[dibyom]

Just one tiny typo. Otherwise LGTM!

[dibyom]

typo: extra > here

[bigkevmcd]

Thanks :-)

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dibyom

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[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/interceptors/cel/triggers.go	87.1%	87.2%	0.1

[dibyom]

/lgtm