expand FFI functionality

[plebhash]

As discussed here, for historical reasons, the FFIs were started with the intention to be imported into Bitcoin Core (TP).

So FFI functionality is currently limited to:

• protocols/v2/codec-sv2
• protocols/v2/const-sv2
• protocols/v2/binary-sv2
• protocols/v2/subprotocols/common-messages
• protocols/v2/subprotocols/template-distribution-sv2

In order to allow firmware integrations (e.g.: skot/ESP-Miner#168), this functionality needs to be expanded with:

• protocols/v2/framing-sv2
• protocols/v2/noise-sv2
• protocols/v2/subprotocols/job-declaration
• protocols/v2/subprotocols/mining

[plebhash]

CI problems discussed above were solved via #1172

hiding the discussion to avoid confusion

the core goal of this issue remains: expand FFI functionality to all protocols crates

[plebhash]

since opening this issue, I changed my mind on this topic

as far as we know, FFIs are not being actively used for any project in the community

the argument for firmware (e.g.: skot/ESP-Miner#168 + https://github.com/plebhash/cgminer-sv2) no longer seems like a meaningful motivation to me, given that in 2025 pure-Rust firmware is perfectly doable (e.g.: https://github.com/bitaxeorg/esp-miner-rs)

expanding FFI functionality would consist of a substantial engineering effort, and we don't really seem to have any real motivation for this