Port BCC tutorial examples to PythonBPF

[r41k0u]

This PR ports all applicable examples from https://github.com/iovisor/bcc/blob/master/docs/tutorial_bcc_python_developer.md to PythonBPF

[r41k0u]

#37 Has been addressed in the last 3 commits

[Copilot]

Pull Request Overview

This PR ports BCC tutorial examples to PythonBPF by adding support for string operations, including helper functions for working with kernel command names and string reading. The implementation adds infrastructure for char array handling, multi-target assignments, and utility functions for trace parsing.

Key changes:

• Added comm and probe_read_str BPF helper functions with proper LLVM IR emission
• Implemented char array to pointer conversion and string copying for struct fields
• Added utilities for parsing kernel trace output (trace_pipe, trace_fields)

Reviewed Changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
pythonbpf/helper/bpf_helper_handler.py	Adds handlers for comm and probe_read_str BPF helpers with buffer validation
pythonbpf/helper/helper_utils.py	Implements buffer pointer extraction and char array type checking utilities
pythonbpf/helper/printk_formatter.py	Refactors expression argument preparation and adds char array formatting support
pythonbpf/assign_pass.py	Implements string-to-char-array copying and pointer conversion for assignments
pythonbpf/allocation_pass.py	Adds support for multi-target assignments and variable/attribute-based allocation
pythonbpf/functions/functions_pass.py	Enables multi-target assignment handling in function bodies
pythonbpf/codegen.py	Returns symbol tables from compilation and changes default log level
pythonbpf/utils.py	Adds trace pipe utilities for reading and parsing kernel trace output
pythonbpf/helper/helpers.py	Adds stub implementations of new helper functions
BCC-Examples/*.py	Example programs demonstrating ported BCC tutorial functionality

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