feat: Implement Filecoin.EthSubscribe and Filecoin.EthUnsubscribe

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

• Implemented Filecoin.EthSubscribe and Filecoin.EthUnsubscribe
• Added newHead subscription
• Added newPendingTransaction subscription

Reference issue to close (if applicable)

Closes

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.

[sudo-shashank]

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