Environment support for multiple hosts or ports - Redo

[rugvedS07]

Overview

Instead of specifying --host --port to make a request to a LM Studio running on other address and to make lms easy to use with multiple lmstudio instances in general, this PR brings in a new feature of 'environments' which are pretty similar to docker context

What commands does it bring?

• lms env add <name> --host <host> --port <port> [--description <desc>] - Add a new environment
• lms env remove <name> - Remove an environment
• lms env ls- List all environments (shows current with *)
• lms env use <name>- Switch to an environment
• lms env current - Show current environment details
• lms env inspect <name> - Show detailed information about a specific environment

Breaking Changes

Removes the --host and --port argument

How does it work?

It creates a new folder - .lmstudio/lms which has two things

1. current-env: store the name of the current environment
2. environments: store all the environment JSON files

Example JSON file for an environment

{
  "name": "remote",
  "host": "localhost",
  "port": 5678,
  "description": "A remote instance of LM Studio"
}

Screenshots of how it works

1. Using the default local environment

2. Switching the a dummy remote instance of LM studio running on some other port

3. Removing a env

4. LMS_ENV support

5. Inspect Command

[yagil]

1. Please restore the PR description from the reverted PR
2. Please add tests for existing lms functionality before merging this, specifically for command syntax