[gwctl] Expand the output of gwctl describe httproute

[gauravkghildiyal]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR builds upon the great work by @tdn21 in #3071. I've rebased, added a new commit adding the requested tests and made some minor changes.

Which issue(s) this PR fixes:

Fixes #3037

Does this PR introduce a user-facing change?:

The output of `gwctl describe httproute <NAME>` now includes more details

/assign @mlavacca
/cc @tdn21

[k8s-ci-robot]

@gauravkghildiyal: GitHub didn't allow me to request PR reviews from the following users: tdn21.

Note that only kubernetes-sigs members and repo collaborators can review this PR, and authors cannot review their own PRs.

In response to this:

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR builds upon the great work by @tdn21 in #3071. I've added a new commit adding the requested tests and some other minor cleanups.

Which issue(s) this PR fixes:

Fixes #3037

Does this PR introduce a user-facing change?:

The output of `gwctl describe httproute <NAME>` now includes more details

/assign @mlavacca
/cc @tdn21

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[mlavacca]

Looks great, @gauravkghildiyal!

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauravkghildiyal, mlavacca

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• gwctl/OWNERS [gauravkghildiyal]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment