Add support for all eBPF helpers

[r41k0u]

This takes over from #63 to add support for all available eBPF helpers.

[r41k0u]

Merging this in the current state to work on the blazesym example. Will pick this up again later.

[Copilot]

Pull Request Overview

This PR adds support for several new BPF helper functions and refactors the temporary variable allocation system to be type-aware. The changes enable helper functions like random(), probe_read(), smp_processor_id(), uid(), and skb_store_bytes() to work correctly with their specific parameter and return types.

Key changes:

• Refactored temporary variable allocation from counter-based to type-aware dictionary-based system
• Added five new BPF helper functions with proper type signatures
• Enhanced helper registry to track parameter and return types for each helper
• Updated argument handling to support type-specific temporary variables

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
pythonbpf/helper/helper_registry.py	Added HelperSignature dataclass and type signature tracking methods
pythonbpf/helper/helpers.py	Added stub implementations for new helper functions
pythonbpf/helper/bpf_helper_handler.py	Implemented emitters for five new BPF helpers with type signatures
pythonbpf/helper/helper_utils.py	Refactored ScratchPoolManager to use type-aware counters and enhanced argument handling
pythonbpf/helper/printk_formatter.py	Refactored to use centralized get_char_array_ptr_and_size utility
pythonbpf/functions/functions_pass.py	Updated temp counting to track types per helper parameter
pythonbpf/allocation_pass.py	Refactored temp pool allocation to be type-aware
pythonbpf/helper/__init__.py	Exported new helper functions
tests/passing_tests/helpers/*.py	Added test files for new helpers

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