[Admin CLI]Add admin rest endpoint/CLI to trim ledgers for a topic upon given position.

[MarvinCai]

Fixes #2736

Motivation

Able to set infinite retention on a namespace and then manually truncate the topic.

Modifications

In ManagedLedgerImpl, expose api to delete ledger upon given position.
Add Admin rest endpoint and CLI for this functionality.

Verifying this change

This change added tests and can be verified as follows:

• Added unit test to verify topic trimming work as expected.

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): no
• The public API: yes
• The schema: no
• The default values of configurations: no
• The wire protocol: no
• The rest endpoints: yes
• The admin cli options: yes
• Anything that affects deployment: no

Documentation

• Does this pull request introduce a new feature? yes
• If yes, how is the feature documented? docs / JavaDocs

[MarvinCai]

@sijie Please take a look.

[codelipenghui]

The pr had no activity for 30 days, mark with Stale label.

[github-actions]

@MarvinCai:Thanks for your contribution. For this PR, do we need to update docs?
(The PR template contains info about doc, which helps others know more about the changes. Can you provide doc-related info in this and future PR descriptions? Thanks)

[tisonkun]

The issue to be fixed was fixed by #10326.