refactor: Evolve BlockStore trait

[matheus23]

• Use new RPITIT instead of async_trait macro for all traits
• Expose blanket implementation impl<B: BlockStore> BlockStore for &B and Box<B>
• Add two functions to trait BlockStore:
  • async fn has_block(&self, cid: &Cid) -> Result<bool>; to find out whether a block is available locally
  • async fn put_block_keyed(&self, cid: &Cid, bytes: impl Into<Bytes> + CondSend) -> Result<()>; to add a block with given CID to the blockstore. This allows us to support adding blocks using different hashing functions to the same blockstore.
• Use explicit BlockStoreError type in trait Blockstore instead of anyhow::Error
• Update rug dependency to 1.24

[codecov]

Codecov Report

Attention: 38 lines in your changes are missing coverage. Please review.

Comparison is base (aff9cf1) 54.52% compared to head (3d5793e) 54.58%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #402      +/-   ##
==========================================
+ Coverage   54.52%   54.58%   +0.05%     
==========================================
  Files          57       57              
  Lines        3943     3959      +16     
  Branches      948      959      +11     
==========================================
+ Hits         2150     2161      +11     
- Misses       1181     1183       +2     
- Partials      612      615       +3     

Files	Coverage Δ
wnfs-common/src/link.rs	39.70% <ø> (ø)
wnfs-hamt/src/hamt.rs	68.75% <ø> (ø)
wnfs-hamt/src/pointer.rs	20.45% <ø> (-1.77%)	⬇️
wnfs-nameaccumulator/src/name.rs	84.81% <ø> (+0.09%)	⬆️
wnfs-nameaccumulator/src/traits.rs	78.33% <100.00%> (-0.70%)	⬇️
wnfs-unixfs-file/src/unixfs.rs	28.23% <ø> (ø)
wnfs/examples/mnemonic_based.rs	0.00% <ø> (ø)
wnfs/src/lib.rs	90.00% <ø> (ø)
wnfs/src/private/forest/hamt.rs	60.00% <ø> (+3.56%)	⬆️
wnfs/src/private/forest/proofs.rs	52.30% <ø> (-1.80%)	⬇️
... and 18 more

... and 1 file with indirect coverage changes