feat: implement eth_getLogs

[zhangliugang]

Summary of Changes

implement eth.getLogs to query events from evm,
Consult:
https://github.com/ethers-io/ethers.js/blob/32915634bef5b81c6d9998f4e9ad812ffe721954/src.ts/abi/interface.ts#L1007

fix: EventFilterParameters.encode(), Topic can not encode as a single string

Test Data or Screenshots

By submitting this pull request, you are confirming the following:

• I have reviewed the Contribution Guidelines.
• I have performed a self-review of my own code.
• I have updated my repository to match the develop branch.
• I have included test data or screenshots that prove my fix is effective or that my feature works.
• I have checked that all tests work and swiftlint is not throwing any errors/warnings.

[JeneaVranceanu]

Suggestion: move it up and potentially combine into a guard statement with input.indexed.

guard input.indexed, !input.type.isArray else { return [] }

[zhangliugang]

I figured it out. If we have a event with 3 fields like

event TestEvent(string indexed f1, int[] indexed f2, int32 indexed f3);

When we want to build a filter to query this event with first and third fields, we have to pass nil to second field, and the topicFilter will be like

[
  '0x07c9b1ca6e62a19a2af4d11a151945afc7d47c89c716a74973b49572c1a715f4',
  '0xab036729af8b8f9b610af4e11b14fa30c348f40c2c230cce92ef6ef37726fee7',
  null,
  '0x0000000000000000000000000000000000000000000000000000000000000064'
]

If combine input.indexed and input.type.isArray together, we can only build a filter with first one field.

[JeneaVranceanu]

lgtm!