feat: Implement `eth_syncing` method

[ermvrs]

Description

https://github.com/keep-starknet-strange/rosettanet/blob/main/rpc-call-examples/starknet_syncing.hurl https://github.com/keep-starknet-strange/rosettanet/blob/main/rpc-call-examples/eth_syncing.hurl

Return mock values if they do not exist on the starknet response.

Requirements

• Unit tests have to be implemented.
• Do not change the existing type structure
• Tests must have non exist transaction results as well.

Completion Time

The issue is assumed to be completed in 5 days. If you need more time, please also specify that.

This issue is reserved for a local event in Istanbul

Bounty: 40 STRK

[0xLucqs]

1h

[codekaya]

if it is ok i can take this one.

[codekaya]

https://github.com/keep-starknet-strange/rosettanet/pull/88

[vibenedict]

I would be my pleasure to fix this

[ermvrs]

@vibenedict do you still want to work on that issue?

[vibenedict]

Yes

[ermvrs]

I assigned you to #71

[Boreas09]

Can i do it