feat(rpc) Implement Filecoin.EthCall

[elmattic]

Summary of changes

Changes introduced in this pull request:

• implement RPC method Filecoin.EthCall
• API compare test

$ ./forest-tool api compare --lotus /ip4/127.0.0.1/tcp/1234/http --forest /ip4/127.0.0.1/tcp/2345/http --filter EthCall
| RPC Method       | Forest | Lotus |
|------------------|--------|-------|
| Filecoin.EthCall | Valid  | Valid |

Reference issue to close (if applicable)

Closes #4613

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[LesnyRumcajs]

@elmattic can we now improve the error messages in other eth methods? I recall you mentioning that some time ago that this method was a blocker for this.

[elmattic]

@elmattic can we now improve the error messages in other eth methods? I recall you mentioning that some time ago that this method was a blocker for this.

I'm sorry, but I don't remember. If this rings a bell, I will open an issue.

[LesnyRumcajs]

@elmattic can we now improve the error messages in other eth methods? I recall you mentioning that some time ago that this method was a blocker for this.

I'm sorry, but I don't remember. If this rings a bell, I will open an issue.

It's this, no? #4554

[elmattic]

@elmattic can we now improve the error messages in other eth methods? I recall you mentioning that some time ago that this method was a blocker for this.

I'm sorry, but I don't remember. If this rings a bell, I will open an issue.

It's this, no? #4554

Indeed!