refactor: opti build circuit input by cache previous block hashes

[SuccinctPaul]

Description

When proving each block, to construct the witness needs to obtain at least the previous(except the block number > 256) block hash, which need 256 times RPC.(It's a bit cost).

• Analysis
  Support each block needs 8s. The oldest block which the witness needed has existed 8s*256=2048s=34mins.
  This means, that when the proving time is within 34min, some of the previous block hash can be reused.

• Solution
  Add cache for them.

• NOTE
  The optimize only works in the second proving task.(The first one cache, the later ones use from cache)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Refactor (no updates to logic)

Contents

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Rationale

[design decisions and extended information]

How Has This Been Tested?

[explanation]

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