Blobstore `Chunk`s do not support borrowed data in Rust

[thomastaylor312]

This is a Rust only request

Right now the put_object and put_chunk functions use the Chunk object. This object requires the bytes to be an owned Vec<u8>. Because the data on incoming requests (like from an HttpRequest from wasmcloud:httpserver) isn't owned, this means that the data has to be cloned to send to the blobstore. So if someone sends a 20 MB file (just as an example), we then have to allocate another 20MB of memory in order to send things.

There are two possible solutions (both of which should be implemented IMO)

1. This is the easier one. Make the blobstore contract support borrowed data for Chunk. This should probably be done either way
2. This is the harder one: Most interfaces should accept owned rather than borrowed data. So for example, the httpserver contract should change from

async fn handle_request(&self, ctx: &Context, req: &HttpRequest) -> RpcResult<HttpResponse>

to

async fn handle_request(&self, ctx: &Context, req: HttpRequest) -> RpcResult<HttpResponse>

NOTE: This could be more of a https://github.com/wasmCloud/weld issue in the end as it deals with generated interface code, but I thought it would be good to start here

[stale[bot]]

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