Add environments to the CLI

[bradhe]

Title says it all: We need to be able to create and list environments from the CLI now that we have better, first-class environments support. This PR introduces that.

╭─bradhe@Mac ~/Development/tower/tower-cli ‹feature/tow-414-modify-cli-to-crud-environments●› 
╰─$ cargo run -- environments list                                  
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.28s
     Running `target/debug/tower environments list`
 Name        
-------------
 default     
 production  
 staging     
 development 
 test        
╭─bradhe@Mac ~/Development/tower/tower-cli ‹feature/tow-414-modify-cli-to-crud-environments●› 
╰─$ cargo run -- environments create --name=second-test       
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
     Running `target/debug/tower environments create --name=second-test`
✔ Creating environment Done!
Success! Environment 'second-test' created
╭─bradhe@Mac ~/Development/tower/tower-cli ‹feature/tow-414-modify-cli-to-crud-environments●› 
╰─$ cargo run -- environments list                     
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s
     Running `target/debug/tower environments list`
 Name        
-------------
 default     
 second-test 
 production  
 staging     
 development 
 test     

[Copilot]

Pull Request Overview

This pull request adds environment management capabilities to the Tower CLI, allowing users to create and list environments through command line interface. The changes include code formatting improvements and introduction of a new environments module for first-class environments support.

• Add CLI commands for creating and listing environments
• Code formatting improvements across multiple files (import reordering, line formatting)
• Update dependencies and module organization

Reviewed Changes

Copilot reviewed 196 out of 199 changed files in this pull request and generated 2 comments.

File	Description
crates/tower-cmd/src/environments.rs	New module implementing environment list and create commands
crates/tower-cmd/src/lib.rs	Add environments subcommand to main CLI interface
crates/tower-cmd/src/api.rs	Add API functions for listing and creating environments
Multiple other files	Code formatting improvements and import reorganization

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[socksy]

sorry for the late review, read through it all now and it LGTM 👍