Update import paths for github.com/devfile/api to github.com/devfile/api/v2

[johnmcollier]

We've recently updated the module path for the github.com/devfile/api Go module to now be github.com/devfile/api/v2, to enable us to release tagged versions of the Go module that match the Devfile schema's version (e.g. module version v2.0.0 for a 2.0.0 schema version). Some discussion on why this was needed can be found here.

This doesn't need to be done immediately, but once a new version of the devfile api is pulled into odo, the import paths for the Devfile API package that odo uses will need to be updated to change instances of import github.com/devfile/api/pkg... in odo to import github.com/devfile/api/v2/pkg.... (e.g. in https://github.com/openshift/odo/blob/adaa1b44e8de5ab0aa0d357294174f8efb8bdd24/pkg/odo/cli/storage/create.go#L7 and https://github.com/openshift/odo/blob/526ce0af8ce506ea4709595a5a9abb160ea3abe1/pkg/url/status_test.go#L8, among other instances)

[kadel]

/priority high
/area dependency
/kind task

[dharmit]

/good-first-issue

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[dharmit]

This will most likely get addressed as a part of what I'm doing on #4160 to add CRD to devfile when user does odo service create.

[mik-dass]

This is a breaking change and many apis have changed in the latest version of the library. Thus a lot of our code base need to change including many unit tests.