Implement process entry execution with parameter mapping

Add support for executing Nextflow processes directly without explicit workflow definitions.

Key Features:
- Single process scripts run automatically: `nextflow run script.nf --param value`
- Multi-process scripts use entry selection: `nextflow run script.nf -entry process:name --param value`
- Automatic command-line parameter mapping to process input channels
- Support for all standard input types: val, path, env, tuple, each
- Comprehensive error handling with helpful suggestions

Implementation:
- Enhanced BaseScript with process entry workflow generation
- Added parameter mapping pipeline with input definition extraction
- Created specialized delegates for parsing compiled process bodies
- Added ScriptMeta methods for single/multi-process detection
- Comprehensive documentation and test coverage

This feature bridges the gap between command-line tools and workflow orchestration,
making Nextflow processes more accessible for direct execution scenarios.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>
Signed-off-by: Paolo Di Tommaso <[email protected]>

Author: pditommaso