feat: wasm non-js

[markphelps]

Re: #327

POC to try using plain wasm / wasmtime to do evaluation without FFI

will fill out more details later

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0.41322% with 241 lines in your changes missing coverage. Please review.

Project coverage is 84.09%. Comparing base (af8bca5) to head (37021de).

Files	Patch %	Lines
flipt-engine-wasm/src/lib.rs	0.00%	155 Missing ⚠️
flipt-engine-wasm-js/src/lib.rs	0.00%	77 Missing ⚠️
flipt-evaluation/src/models/common.rs	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #328      +/-   ##
==========================================
- Coverage   88.38%   84.09%   -4.29%     
==========================================
  Files          10       11       +1     
  Lines        3686     3874     +188     
==========================================
  Hits         3258     3258              
- Misses        428      616     +188     

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[GeorgeMac]

Very excited to see us explore WASM more for this.
Just a note though (you're probably aware): wasmtime-go is CGO and C FFI. So doesn't address the problem of having to have wasmtime installed for the host OS in order to use these clients. As opposed to say wazero which can be entirely statically compiled into the client.

[markphelps]

Very excited to see us explore WASM more for this. Just a note though (you're probably aware): wasmtime-go is CGO and C FFI. So doesn't address the problem of having to have wasmtime installed for the host OS in order to use these clients. As opposed to say wazero which can be entirely statically compiled into the client.

yeah we could try wazero as well instead of wasmtime. another potential option is use an approach like mentioned here #141 (comment), re libkafka maybe? would the end user still need to install wasmtime locally then?