feat: add log to cli and make examples work

[appcypher]

Description

This PR includes several significant updates across the codebase:

1. Added new logging functionality:

   • Implemented mc log command with options for lines (-n), no-pager, and follow (-f)
   • Added log streaming support with async capabilities

2. Improved example applications:

   • Added new microvm_counter example demonstrating Python and Shell implementations
   • Updated all examples to use consistent image reference parsing
   • Standardized rootfs directory path handling

3. Enhanced documentation:

   • Expanded README.md with more detailed features and examples
   • Added comprehensive configuration schema documentation
   • Updated troubleshooting section with macOS-specific guidance

4. Code organization and cleanup:

   • Moved monocore.entitlements to root directory
   • Updated Makefile paths to reflect new entitlements location

Link to issue

N/A - Feature enhancement and code organization

Type of change

• New feature (non-breaking change which adds functionality)
• Refactor (non-breaking change that improves existing functionality)
• This change requires a documentation update

Test plan (required)

1. Test new logging functionality:

mc up -f monocore.example.toml
mc log sh-counter
mc log python-counter -n 5
mc log sh-counter -f

2. Verify example applications:

make example microvm_counter
make example microvm_curl
make example microvm_shell

3. Confirm documentation accuracy:

• Review updated README.md
• Verify configuration schema examples
• Test all documented commands