Add Percona Server configuration and bootstrap profiles (#236)

[akuzminsky]

Summary

• Implements complete Percona Server configuration management
• Adds bootstrap integration with ih-mysql CLI from infrahouse-toolkit
• Configures MySQL with GTID replication settings for master/replica topology

Changes

File	Purpose
packages.pp	Installs percona-server-server and client
config.pp	Configures my.cnf with GTID replication, auto-calculated buffer pool
service.pp	Manages MySQL service
bootstrap.pp	Calls ih-mysql bootstrap for master election and replica setup
mysqld.cnf.erb	MySQL configuration template with GTID settings

Bootstrap Behavior

The ih-mysql bootstrap command (from infrahouse-toolkit) handles:

• Master election via DynamoDB distributed lock
• MySQL user creation (repl, backup, monitor) on master only
• Replica configuration with GTID replication (users replicated automatically)
• NLB target group registration (write TG for master, read TG for all)

Required Facts

Custom facts in /etc/puppetlabs/facter/facts.d/custom.json:

• percona.cluster_id - Unique cluster identifier
• percona.dynamodb_table - DynamoDB table for locking
• percona.credentials_secret - AWS Secrets Manager secret name
• percona.vpc_cidr - VPC CIDR for user host restrictions
• percona.read_tg_arn - Read target group ARN
• percona.write_tg_arn - Write target group ARN

Test plan

• Deploy to development environment with 3 EC2 instances
• Verify first instance becomes master and creates users
• Verify second/third instances become replicas
• Verify replication is working (SHOW REPLICA STATUS)
• Verify target group registrations