feat: add pending block with receipts

[mattsse]

Adds another function to unblock #3321

we need to fetch this one go, because this is susceptible to a race and hence block + receipts can't be fetched in two separate calls using the existing methods

[onbjerg]

lgtm, although I would like a note in the docs on the potential race condition so it is documented

[codecov]

Codecov Report

Merging #3404 (669509b) into main (49922bf) will decrease coverage by 0.13%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3404      +/-   ##
==========================================
- Coverage   69.41%   69.29%   -0.13%     
==========================================
  Files         537      537              
  Lines       71991    72058      +67     
==========================================
- Hits        49973    49933      -40     
- Misses      22018    22125     +107     

Flag	Coverage Δ
integration-tests	16.30% <0.00%> (-0.04%)	⬇️
unit-tests	64.37% <0.00%> (-0.11%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
crates/blockchain-tree/src/shareable.rs	40.51% <0.00%> (-2.22%)	⬇️
crates/interfaces/src/blockchain_tree/mod.rs	31.57% <ø> (ø)
...tes/storage/provider/src/providers/database/mod.rs	24.47% <0.00%> (-0.32%)	⬇️
...torage/provider/src/providers/database/provider.rs	74.22% <0.00%> (-0.19%)	⬇️
crates/storage/provider/src/providers/mod.rs	8.56% <0.00%> (-0.13%)	⬇️
crates/storage/provider/src/test_utils/mock.rs	23.94% <0.00%> (-1.91%)	⬇️
crates/storage/provider/src/test_utils/noop.rs	22.17% <0.00%> (-4.26%)	⬇️
crates/storage/provider/src/traits/block.rs	30.76% <ø> (ø)

... and 33 files with indirect coverage changes