docs: Add VPC Lattice concepts and troubleshooting guide (#9351)

[deepatidarr]

*Issue #9351 *

Description of changes:
This PR adds comprehensive documentation for Amazon VPC Lattice in the AWS CLI examples.

The documentation includes:

• Core concepts and components of VPC Lattice
• End-to-end setup example with AWS CLI commands
• Best practices for security, monitoring, and scalability
• Detailed troubleshooting guide with common issues and solutions
• Diagnostic commands for common operations

Fixes #9351

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[ashovlin]

How did you test or intend to consume this @deepatidarr ?

We have one existing _concepts.rst file for S3, which are hand-written commands unlike VPC Lattice.

aws-cli/awscli/customizations/s3/s3.py

Line 52 in 558d3d4

DESCRIPTION = BasicCommand.FROM_FILE('s3/_concepts.rst')

I don't believe we'll pick up this file for the HTML API reference. Was that your intention?

[deepatidarr]

Hey, first of all thanks for reviewing my contribution. My intention was to provide comprehensive documentation for VPC Lattice in a similar manner to the existing S3 _concepts.rst file. I just wanted to enhance the understanding of VPC Lattice concepts and provide practical examples and troubleshooting tips for users.

Also, yes that was my intention, if there are specific steps or modifications needed to ensure it is picked up for the HTML API reference or any other documentation process, I would appreciate your advice.

Again, thank you for your time.