Fix the way we are handling metadata

[JesseAbram]

I hate it I hate it so much. Im open to ideas to fix it

Issue

• need metadata for subxt calls
• metadata is large and makes the program bloated
• Also cuz in wasm can't use fs or other methods for getting it in core (no wasm enviroments)
• Metadata is literally a Vec I load in as a lazy_static const

Some Pondering

• How much of the metadata do we need to make an offline api and one call
• If we can generalize it, it can work for all chains

[ameba23]

I guess one way to keep the metadata out of the program binary would be to pass it in as program configuration at the point of deploying a program. But this still means it will be stored on chain, and worse, there is no way to deduplicate it if a bunch of people use the program. So from that point of view its better to have the metadata in the program binary.

Another option would be to have entropy_programs_runtime make the chain metadata available to programs, or even a fully prepared OfflineClient. This is nice because we wouldn't need to decode the metadata and program runtime. But i would not be generic for all chains.