feat: add AlmaLinux support, MPM selection, and modernize role

[sdickenson]

Summary

• Add AlmaLinux 9 and 10 platform support
• Add MPM selection (prefork, worker, event) for all Apache 2.4 distros via apache_modular_config variable, replacing brittle version-string checks in templates
• Modernize Ansible syntax: FQCNs (ansible.builtin.*), YAML dict syntax, quoted file modes, ansible.builtin.package instead of ansible.builtin.yum
• Update httpd.conf with proper Apache 2.4 IfModule blocks for all three MPMs using modern directive names (MaxRequestWorkers, MaxConnectionsPerChild)
• Bump minimum Ansible version to 2.10
• Update author metadata and version to 1.0.0
• Add .gitignore

Notes

• Default apache_mpm_module remains prefork — no behavior change for existing deployments
• First run on existing hosts will trigger an Apache reload due to config content changes (functionally equivalent config)
• lock_timeout removed from package tasks

Test plan

• Verify role applies cleanly on AlmaLinux 9
• Verify role applies cleanly on AlmaLinux 10
• Verify role applies cleanly on Amazon Linux 2023
• Verify MPM selection works (set apache_mpm_module: event and confirm correct module loaded)
• Verify existing CentOS 7 / Amazon 2 deployments converge without errors
• Verify legacy distros (CentOS 6) still get Apache 2.2 config

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