feat(cli): add AWS PrivateLink human-friendly commands

[joshrotenberg]

Summary

Adds typed CLI commands for AWS PrivateLink connectivity operations, completing 100% CLI coverage for the Cloud API.

Background

PR #406 added the to the redis-cloud library with 10 methods. This PR adds the corresponding human-friendly CLI commands so users don't have to use raw API access.

Commands Added

# Get PrivateLink configuration
redisctl cloud connectivity privatelink get --subscription <id>

# Create PrivateLink
redisctl cloud connectivity privatelink create --subscription <id> <json-data>

# Add principals (AWS accounts, IAM roles, etc.)
redisctl cloud connectivity privatelink add-principal --subscription <id> <json-data>

# Remove principals
redisctl cloud connectivity privatelink remove-principal --subscription <id> <json-data>

# Get VPC endpoint creation script
redisctl cloud connectivity privatelink get-script --subscription <id>

Active-Active (CRDB) Support

All commands support Active-Active databases via optional --region flag:

redisctl cloud connectivity privatelink get --subscription 123 --region 1

Examples

# Get PrivateLink configuration
redisctl cloud connectivity privatelink get --subscription 123 -o json

# Create PrivateLink with JSON data
redisctl cloud connectivity privatelink create --subscription 123 \
  '{"shareName":"my-share","principal":"123456789012","type":"aws_account"}' \
  --wait

# Add IAM role principal
redisctl cloud connectivity privatelink add-principal --subscription 123 \
  '{"principal":"arn:aws:iam::123456789012:role/MyRole","type":"iam_role"}'

# Get endpoint creation script
redisctl cloud connectivity privatelink get-script --subscription 123

Architecture

Follows the established pattern from VPC Peering, PSC, and Transit Gateway:

• Commands defined in cli.rs as PrivateLinkCommands enum
• Handler implementation in commands/cloud/connectivity/private_link.rs
• Integrated into CloudConnectivityCommands
• Supports all standard features: --wait, --output, --query, etc.

CLI Coverage Status

Cloud API vs CLI: 100% complete

All Cloud API handlers now have human-friendly CLI commands:

• ✅ Account (8/8)
• ✅ ACL (13/13)
• ✅ Provider Accounts (5/5)
• ✅ Subscriptions (13/13)
• ✅ Fixed Subscriptions (8/8)
• ✅ Databases (18/18)
• ✅ Fixed Databases (11/11)
• ✅ VPC Peering (4/4)
• ✅ Private Service Connect (6/6)
• ✅ Transit Gateway (6/6)
• ✅ PrivateLink (5/5) ← NEW
• ✅ Tasks (2/2)
• ✅ Users (4/4)

Quality Checks

• ✅ Compiles cleanly
• ✅ Clippy passes with no warnings
• ✅ Formatted with cargo fmt
• ✅ Help output verified for all commands
• ✅ Follows established CLI patterns

Related

• Depends on: feat(redis-cloud): add AWS PrivateLink connectivity support #406 (AWS PrivateLink library implementation)
• Completes: 100% Cloud API CLI coverage