feat(rke2): support structured configuration options

[anjia0532]

• Add conditional handling for mapping-type options
• Enable key-value pair rendering for server options
• Enable key-value pair rendering for agent options
• Enable key-value pair rendering for environment options
• Maintain backward compatibility with string options
• Improve template logic for configuration generation

Description

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Small minor change not affecting the Ansible Role code (GitHub Actions Workflow, Documentation etc.)

How Has This Been Tested?

The original syntax is list string (doc https://github.com/lablabs/ansible-role-rke2/blob/main/README.md?plain=1#L301-L317)

# e.g. 
rke2_server_options:
  - "option: value"
rke2_agent_options:
  - "option: value"
rke2_environment_options:
  - "option: value"

The new syntax support list string and list object

# e.g.
rke2_server_options:
  - "option1: value"
  - option2: value2

[MonolithProjects]

LGTM. Thanks