Make jsonrpc api engine agnostic.

[debris]

cc @frozeman @obscuren

Goal

Make jsonrpc api engine agnostic.

Issue.

Currently jsonrpc methods eth_getBlockByHash and eth_getBlockByNumber return block objects with field nonce. Oddly, the other pow specific param mixHash does not exist.

nonce: DATA, 8 Bytes - hash of the generated proof-of-work. null when its pending block.

PoA blocks does not have nonce property.

Proposed solution

Replace nonce field with seal_fields. An array containing all engine specific fields.

"seal_fields": ["0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa", "0x0000000000000042"]

[frozeman]

Makes sense. Any opinion @vbuterin

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[github-actions]

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