Solve error at block 0 on syncing status

[stdevMac]

Resolves #383

Description

When the node starts to run for the first time when called the method starknet_syncing, it will try to ask for block information that isn't yet on the database, so, it will return nil.

With this approach, we are returning 0 in case of those blocks are not found yet on the database.

Changes:

• Catch edge case on starknet_syncing at block 0
• Refactor struct of SyncingStatus on RPC

Types of changes

• Bugfix (non-breaking change which fixes an issue)

Testing

Requires testing: Yes

Did you write tests??: No

Documentation

If this requires a documentation update, did you add one? No

[codecov[bot]]

Codecov Report

Merging #392 (0f4b353) into main (4b200cd) will decrease coverage by 0.02%. The diff coverage is 90.32%.

@@            Coverage Diff             @@
##             main     #392      +/-   ##
==========================================
- Coverage   93.15%   93.13%   -0.03%     
==========================================
  Files          67       67              
  Lines        7192     7208      +16     
==========================================
+ Hits         6700     6713      +13     
- Misses        486      488       +2     
- Partials        6        7       +1     

Flag	Coverage Δ
unittests	93.13% <90.32%> (-0.03%)	:arrow_down:

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

Impacted Files	Coverage Δ
internal/rpc/starknet/starknet.go	0.00% <ø> (ø)
internal/rpc/starknet/types.go	24.08% <75.00%> (+2.12%)	:arrow_up:
internal/sync/sync.go	100.00% <100.00%> (ø)
pkg/felt/felt.go	100.00% <0.00%> (ø)

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