Add OPA policy support

[binodmx]

Purpose

This PR resolves #1164 by adding OPA policy config for API Policies. An OPA policy can be added by defining oPAPolicy property in APIPolicy kind. Following is an sample APIPolicy kind which includes a OPA policy.

apiVersion: dp.wso2.com/v1alpha1
kind: APIPolicy
metadata:
  name: sample-api-policy
  namespace: apk
spec:
  override:
    oPAPolicy:
      serverURL: http://opa-svc.apk:8181/v1/data
      policy: opa/test
      rule: allow
  targetRef:
    group: dp.wso2.com
    kind: API
    name: http-bin-api
    namespace: apk

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.18 ⚠️

Comparison is base (8aab219) 32.56% compared to head (5e4cd2f) 32.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1193      +/-   ##
==========================================
- Coverage   32.56%   32.38%   -0.18%     
==========================================
  Files         188      188              
  Lines       21795    21920     +125     
  Branches     7026     7100      +74     
==========================================
+ Hits         7097     7099       +2     
- Misses      14573    14696     +123     
  Partials      125      125              

Flag	Coverage Δ
adapter	24.02% <ø> (-0.03%)	⬇️
admin-domain-service	52.40% <ø> (ø)
backoffice-domain-service	57.51% <ø> (-0.23%)	⬇️
devportal-domain-service	29.85% <ø> (-1.67%)	⬇️
idp-domain-service	80.10% <ø> (ø)
runtime-domain-service	32.15% <ø> (ø)

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see 9 files with indirect coverage changes

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[AmaliMatharaarachchi]

we will be reopening this PR with the mediation app implementation. Hence we will be closing as we are expecting changes to these CRs in future