Implement "install" command for artifact type

[QuanZhang-William]

Part of #691. Prior to this commit, the tkn hub install command is only supported with --type tekton. This commit adds the tkn hub install functionality for --type artifact, which fetches resources from the Artifact Hub and install to user's cluster.

Example:
tkn hub install task golang-build --from tekton-catalogs-task --version 0.2.0

Changes

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes tests (if functionality changed/added)
• Run API Unit Tests, Lint Checks, API Design, Golden Files with make api-check
• Run UI Unit Tests, Lint Checks with make ui-check
• Commit messages follow commit message best practices

See the contribution guide for more details.

[tekton-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[QuanZhang-William]

/test pull-tekton-hub-unit-tests

[tekton-robot]

@QuanZhang-William: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-tekton-hub-unit-tests	2363bf1	link	true	/test pull-tekton-hub-unit-tests

Full PR test history. Your PR dashboard.

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[QuanZhang-William]

/hold

[QuanZhang-William]

Will first merge the PR to refactor get_resources & get_resource_version in #752 and implement based on the refactored code

/close

[tekton-robot]

@QuanZhang-William: Closed this PR.

In response to this:

Will first merge the PR to refactor get_resources & get_resource_version in #752 and implement based on the refactored code

/close

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