[FLI-570] Leverage Wazero Experimental FS

[GeorgeMac]

Wazero 1.4 will come with a new experimental FS interface.
This will allow for custom implementations to handle writeable filesystem operations.
I think we could leverage these capabilities to avoid having to always have write operations go the filesystem.
Perhaps doing everything in memory this way wont scale for certain operations. However, it may be nice to have the choice.

tetratelabs/wazero#1605

_FLI-570