fix: make MtmdBitmap and MtmdContex Send + Sync

[vigsterkr]

No description provided.

[MarcusDunn]

I'll need safety comments for these.

[vigsterkr]

@MarcusDunn it follows exactly what ha been done here: https://github.com/utilityai/llama-cpp-rs/blob/main/llama-cpp-2/src/model.rs#L177

i've checked into the actual c++ implementation and it is thread-safe afaik.

[MarcusDunn]

i've checked into the actual c++ implementation and it is thread-safe afaik.

add a comment to this effect and we're good to go!

My lack of comments on my own unsafe impls doesn't mean it's a good idea! :)

[vigsterkr]

@MarcusDunn ping. btw in order to get this really working (mtmd) one of these PRs should be merged:
#810
#806

do you want me to pick up one of those and address your feedbacks? or there is a fundamental reason you dont want to merge them?

[MarcusDunn]

One is a draft. The other is pending PR comments.

[MarcusDunn]

Feel free to get either across the finish line. I always appreciate contributions!

[vigsterkr]

@MarcusDunn if no objections i can address the comments. would be great having that finally fixed.

[MarcusDunn]

Agreed! One you address the outstanding comments I may give another review to finish it off.