generate virtualservice: path match type flag

[eguzki]

By default, the command kuadrantctl generate istio virtualservice generates Istio VirtualService object with path match type exact.

http:
    - name: getCat
      match:
        - uri:
            exact: /cat
          method:
            exact: GET

OAS 3.X does not explicitly specify it, so this PR adds a command flag to support a new path match type: prefix. With the command line option --path-prefix-match

kuadrantctl generate istio virtualservice --path-prefix-match

The VirtualService will be generated for path match type prefix.

http:
    - name: getDog
      match:
        - uri:
            prefix: /dog
          method:
            exact: GET

This behavior modifies all the operations read from the OAS. If the path match type needs to be specified per OAS operaton, it is best to explore OAS extensions.

[codecov-commenter]

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[eguzki]

No review in 7 days... applying automerge if nobody reviews in 7 days well known merge policy