re-randomize srs

[zhenfeizhang]

Description

• requires expose param field for re-randomization halo2#67
• requires scroll-prover integration test before merge
  • to test this feature, one can do

let mut param = read_srs(...) ;
re_randomize_srs(&param, seed);

once this is fully tested, we will build CLI to generate new param.

Issue Link

[link issue here]

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

Contents

• [item]

Rationale

[design decisions and extended information]

How Has This Been Tested?

[explanation]

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This PR contains:
- Cleanup of xxxx, yyyy
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Design choices

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[zhenfeizhang]

CI failed because scroll-tech/halo2#67 is not merged. will re-run CI once it is merged

[Sadagoodbye]

this is simply