Jelilat/implement-starknet_getClassAt

[jelilat]

Closes https://github.com/NethermindEth/juno/issues/351

Description

This PR implements the starknet_getClassAt JSON RPC method as per version 0.1.0 of the specification

Changes:

• Added the starknet_getClassAt method.

Types of changes

• New feature (non-breaking change which adds functionality)

Testing

Requires testing: Yes

Did you write tests?: No. Testing was done manually.

[codecov[bot]]

Codecov Report

Merging #358 (6cef8ec) into main (c5cc557) will decrease coverage by 0.41%. The diff coverage is 83.61%.

@@            Coverage Diff             @@
##             main     #358      +/-   ##
==========================================
- Coverage   92.84%   92.42%   -0.42%     
==========================================
  Files          67       67              
  Lines        7350     7397      +47     
==========================================
+ Hits         6824     6837      +13     
- Misses        519      551      +32     
- Partials        7        9       +2     

Flag	Coverage Δ
unittests	92.42% <83.61%> (-0.42%)	:arrow_down:

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

Impacted Files	Coverage Δ
internal/db/state/contract.go	100.00% <ø> (ø)
internal/juno/juno.go	100.00% <ø> (ø)
internal/rpc/starknet/starknet.go	0.00% <0.00%> (ø)
internal/rpc/starknet/types.go	18.52% <0.00%> (-1.29%)	:arrow_down:
internal/sync/sync.go	100.00% <ø> (ø)
internal/sync/utils.go	100.00% <ø> (ø)
pkg/feeder/feeder.go	100.00% <ø> (ø)
pkg/types/class.go	93.22% <93.22%> (ø)
internal/cairovm/vm.go	100.00% <100.00%> (ø)
internal/cairovm/vmrpc/vm.go	87.23% <100.00%> (+3.90%)	:arrow_up:
... and 10 more

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