feat: add proof keeper

[will-2012]

Description

Add the proof keeper(only in path-base, bufferlist config) component to store the proposed proof in the background, and the op-proposal can query the proof in the proof keeper.

Rationale

nodebufferlist watch the block height and stores the proof of the corresponding block height according to the configuration.

Example

./op-geth \
  ...
  --state.scheme path \
  --pathdb.nodebuffer list \
  --pathdb.proposeblock 240 \
  --pathdb.enableproofkeeper \
  --pathdb.keepproofblockspan 100000 \ # This is optional, default is 90000.
  ...

This pathdb.enableproofkeeper enable proof keeper.

Changes

Notable changes:

• core: add proof keeper skeleton.
• rawdb: add keeper meta and proof data api.
• pathdb: add watcher func in nodebufferlist.
• API: adjust get proof API, can dispatch request to proof keeper.

[krish-nr]

LGTM

[welkin22]

LGTM

[redhdx]

LGTM