⚠️ Breaking Changes: Migrate model subcommand to model analyze

[ChenYi015]

What this PR does / why we need it:

Migrate arena model subcommand to arena model analyze.

Which issue(s) this PR fixes:
Fixes #1061

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[Syulin7]

@ChenYi015 Thanks! Looks good. Can you do a rebase?

[ChenYi015]

@ChenYi015 Thanks! Looks good. Can you do a rebase?

Done!

[Syulin7]

/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ChenYi015, Syulin7

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:

• OWNERS [Syulin7]

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