feat(workspace): Isolate FPVM-specific platform code

[clabby]

Overview

Isolates the FPVM-specific platform code into separate crates. This solves the issues that zkVM teams are having with the kona-client libs being coupled to the kona-common IO pattern.

This PR will be followed up with a new kona-client library, that just serves the entrypoint, generic over the communication Channel. From there, we can run kona-client in the host w/ tokio channels in the same process, and reuse the same logic for the entry point with a kona-std-fpvm::FileChannel

[clabby]

📚 $\text{Stack Overview}$

Pulls submitted in this stack:

• feat(book): Update book for FPVM crate changes #840
• feat(host): Run client program natively in process #836
• feat(workspace): Isolate FPVM-specific platform code #821 👈
• main

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[codecov]

Codecov Report

Attention: Patch coverage is 22.77228% with 78 lines in your changes missing coverage. Please review.

Project coverage is 90.6%. Comparing base (657d313) to head (2b96a72).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/proof-sdk/std-fpvm/src/tracing.rs	0.0%	34 Missing ⚠️
crates/proof-sdk/std-fpvm/src/io.rs	0.0%	30 Missing ⚠️
crates/proof-sdk/std-fpvm/src/channel.rs	13.3%	13 Missing ⚠️
crates/proof-sdk/preimage/src/native_channel.rs	90.0%	1 Missing ⚠️

Additional details and impacted files

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