EIP:7823 Set upper bounds for MODEXP && EIP-7883: ModExp Gas Cost && EIP-7951: Precompile for secp256r1 Curve Support (#1248)

* EIP:7823 Set upper bounds for MODEXP

* fmt

* add EIP 7883

* update P256Verify

* address comments

* update comments

* fix P256VerifyGas after galileo upgrade

* fix lint

* fix test

* update

* fix comments

Author: georgehao