Hash types conversions unhandled panics

[Alrighttt]

Types such as H256 and H264 have methods that can cause a runtime panic.

This is due to Indexing into a slice without first checking the size of the slice:

komodo-defi-framework/mm2src/mm2_bitcoin/primitives/src/hash.rs

Line 45 in 4d0f812

inner[..].clone_from_slice(&slc[0..$size]);

ex:

use rpc::v1::types::H264;
let some_vec = vec![0u8];
let this_panics: H264 = some_vec.as_slice().into();

panicked at 'range end index 33 out of range for slice of length 1', mm2src/mm2_bitcoin/primitives/src/hash.rs:157:1

culprit:
https://github.com/KomodoPlatform/komodo-defi-framework/blob/4d0f812ac5089364de51f896e282c419019ac4f9/mm2src/mm2_bitcoin/primitives/src/hash.rs#L42C1-L48C10
https://github.com/KomodoPlatform/komodo-defi-framework/blob/4d0f812ac5089364de51f896e282c419019ac4f9/mm2src/mm2_bitcoin/rpc/src/v1/types/hash.rs#L34C1-L39C10

This From implementation must be replaced with TryFrom or made infallible. Additionally there is an instance of .unwrap() in From<&'static str> for each hash type.

These types originate from parity bitcoin. I believe the macros for implementing these are implementing far more types than we utilize. We should consider minimizing the use of this hash module.