Configurable networking

[lacraig2]

This pull request adds a new virtual network device (igloonet) and introduces new portal operations for network device registration and lookup, as well as a new operation to retrieve the current task's register state (pt_regs). It also includes some refactoring and minor improvements for kernel compatibility and debugging.

Key changes include:

Networking: Virtual Network Device and Portal Integration

• Added a new virtual network device driver igloonet in src/netdevs/igloonet.c with kernel version compatibility, stats handling, and registration logic. ([src/netdevs/igloonet.cR1-R231](https://github.com/rehosting/igloo_driver/pull/38/files#diff-ff7aefdfa5fd278c30e5e878238ccfa6959373b2c1c952e7d69d8dabdcb888e2R1-R231))
• Declared the igloonet_init_one function in src/netdevs/igloonet.h for network device initialization. ([src/netdevs/igloonet.hR1](https://github.com/rehosting/igloo_driver/pull/38/files#diff-d9e6b5b79c8d131833380279115d47dc49f7580b36a9615e6be2cfb0edde308bR1))
• Updated the src/Makefile to include the new igloonet.o object file. ([src/MakefileR19](https://github.com/rehosting/igloo_driver/pull/38/files#diff-3e2513390df543315686d7c85bd901ca9256268970032298815d2f893a9f0685R19))
• Implemented portal handlers for registering and looking up network devices in src/portal/portal_net.c. ([src/portal/portal_net.cR1-R42](https://github.com/rehosting/igloo_driver/pull/38/files#diff-e81eff9393cf32bde1989d2928662e38a88f87cd64ce159adcd704735b4066e9R1-R42))
• Registered new portal operations for network device management in src/portal/portal_op_list.h. ([src/portal/portal_op_list.hR28-R29](https://github.com/rehosting/igloo_driver/pull/38/files#diff-e828a599b2dac6cfa65bd84b9d8183262bce6d34d9a5c1806d3f07dc2de90cb0R28-R29))

Process State Inspection

• Added a new portal operation and handler to retrieve the current process's pt_regs structure, enabling inspection of CPU register state from the portal. ([[1]](https://github.com/rehosting/igloo_driver/pull/38/files#diff-1e88c82aece923fb5ed7055baf8447ff2f402e4187bc72f43ec66aedf28f0b4aR878-R913), [[2]](https://github.com/rehosting/igloo_driver/pull/38/files#diff-e828a599b2dac6cfa65bd84b9d8183262bce6d34d9a5c1806d3f07dc2de90cb0R13), [[3]](https://github.com/rehosting/igloo_driver/pull/38/files#diff-1e88c82aece923fb5ed7055baf8447ff2f402e4187bc72f43ec66aedf28f0b4aR15))

FFI and Debugging Improvements

• Changed the type of func_ptr in struct portal_ffi_call from void * to unsigned long for improved compatibility and correctness. ([src/portal/portal_types.hL102-R102](https://github.com/rehosting/igloo_driver/pull/38/files#diff-e6a749233e740a1ceea47b8ecf5edf43b5cbe40c1a1a31526c2cd3064989d8c1L102-R102))
• Improved debug logging in FFI function pointer validation and invocation by explicitly casting pointers to void *. ([[1]](https://github.com/rehosting/igloo_driver/pull/38/files#diff-3408adeeb373fee66db55fd2148e6b0a79b66b1c44e1b34ceacefc7220d90680L64-R64), [[2]](https://github.com/rehosting/igloo_driver/pull/38/files#diff-3408adeeb373fee66db55fd2148e6b0a79b66b1c44e1b34ceacefc7220d90680L77-R77))