CLI: restructure commands (breaking change!)

[olafurpg]

This PR batches several breaking changes to the Cody cli tool. See individual commit messages for details:

commit 12d7bda (HEAD -> olafurpg-cody-2752-remove-automatic-jsonrpc-command, olafurpg/olafurpg-cody-2752-rem
ove-automatic-jsonrpc-command)
Author: Olafur Geirsson [email protected]
Date: Fri Jul 5 10:47:02 2024 +0200

Minor improvements to `cody --help`

Fixes CODY-2777

- Display `cody` in --help message
- Show `auth` and `chat` subcommands at the top
- Display correct version number
- Move `cody cody-bench` to `cody internal bench`

commit 6c3506b
Author: Olafur Geirsson [email protected]
Date: Fri Jul 5 10:46:41 2024 +0200

Update changelog and outdated CLI docs

Fixes CODY-2778

commit 033585e
Author: Olafur Geirsson [email protected]
Date: Fri Jul 5 10:26:57 2024 +0200

CLI: restructure commands

Fixes CODY-2634

- `cody jsonrpc` is now `cody api jsonrpc-stdio`.
- `cody server` is now `cody api jsonrpc-websocket`.
- Files consistently use the `command-NAME.ts` name convention making it
  easier to find them in the fuzzy finder.

commit e187aab
Author: Olafur Geirsson [email protected]
Date: Fri Jul 5 10:20:11 2024 +0200

CLI: remove automatic `jsonrpc` command

Fixes CODY-2752

Previously, running `cody-agent` started the `cody-agent jsonrpc`
subcommand. This was done for historical reasons that are no longer
important. This is a breaking change and means that IDE clients will
need to explicitly mention the `api jsonrpc` subcommand now.

Test plan

Green CI.

[github-actions]

‼️ Hey @sourcegraph/cody-security, please review this PR carefully as it introduces the usage of an unsafe_ function or abuses PromptString.

[pkukielka]

LGTM