Enable secp256r1 in Antehandlers

[robert-zaremba]

Summary

In #7718 we are adding secp256r1 to the SDK.
In #8415 we implemented address generation algorithm for custom schemes.

Here, we want to enable secp256r1 in CheckTx validation of antehandlers.

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[robert-zaremba]

For the gas cost I propose:

• benchmark the secp256r1 against cgo secp256k1
• instead of creating a new parameter for gas price, set the gas fee as a factor of secp256k1 gas fee based on the benchmark above.

[robert-zaremba]

benchmarking current implementation:

BenchmarkSig/secp256k1     4334   277167 ns/op   4128 B/op   79 allocs/op
BenchmarkSig/secp256r1    10000   108769 ns/op   1672 B/op   33 allocs/op

Based on the results above the factor would be 2x. However I propose to discount it and
use 1.2x because we are comparing a highly optimized cgo implementation of secp256k1 to
a go stdlib secp256r1. In other benchmark we found that ported secp256k1 to stdlib based
implementation wold be 20x slower.

[robert-zaremba]

I wrote the comment above while being sick. the secp256r1 is 2.7 times faster, not slower. So will use 0.5 factor for the gas fee compared to secp256k1.