feat: cortex engines uninstall <engine_id>

[namchuai]

Problem
According to https://github.com/janhq/cortex/issues/1072, we should support uninstall engine.

Success Criteria
Working CLI command for cortex engines <engine> uninstall
API for uninstall engine. Not approved yet but I think will be:

• Method: DELETE
• engines/<engine>

Additional context
N/A

cc @vansangpfiev @nguyenhoangthuan99 @Van-QA @dan-homebrew

Tasklist

• Tests
• Docs

[dan-menlo]

@namchuai @vansangpfiev @SAng

cortex <feature> <command> <subject>
cortex engines uninstall <engine>
cortex engines install <engine>
cortex engines list

We would only move to a cortex engines <engine> <command>, if engines expose their own CLI in the future (imho this is still far away)

cortex engines tensorrt-llm <config>

[namchuai]

ok, then please let me update accordingly

[freelerobot]

@namchuai can you guys take a look at the syntax discussion in: #1109

We should try to avoid small inconsistencies in syntax. e.g.

# preferred
cortex engines uninstall <engine>

# less preferred
cortex engines <engine> uninstall 

[namchuai]

Since the PR is merged, I will move this item to QA.

[freelerobot]

QA'd and closing