refactor: support dynamic emulation parameters for ecrec

[ivokub]

Description

Adds support for dynamic limb parameters for ECRECOVER precompile for using in Linea with small fields. Does not change limb composition for large fields.

Type of change

• New feature (non-breaking change which adds functionality)

How has this been tested?

• TestOverKoalabear

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I did not modify files generated from templates
• golangci-lint does not output errors locally
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

---

Note

Switch ECRECOVER and its hint to dynamic limb sizing based on the native modulus and add a test over koalabear.

• ECRecover (std/evmprecompiles/01-ecrecover.go):
  • Use GetEffectiveFieldParams[Secp256k1Fp] to derive nbFpLimbs from the native field.
  • Update hint output sizing and limb slicing to use nbFpLimbs.
• Hints (std/evmprecompiles/hints.go):
  • Change recoverPublicKeyHint signature to accept nativeMod and compute dynamic params via GetEffectiveFieldParams for both Fr and Fp.
  • Adjust input/output length checks and (re)composition using dynamic limb counts/bits; update zero-flag index to 2*nbFpLimbs.
• Tests (std/evmprecompiles/01-ecrecover_test.go):
  • Add TestOverKoalabear to solve the circuit over koalabear.Modulus().

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