refactor(auth): Move sig verification out of the for loop, into the authenticate method.

[testinginprod]

Description

Closes: #XXXX

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[coderabbitai]

Walkthrough

The change involves a significant refactoring in the cosmos-sdk, particularly within the authentication module. It optimizes the signature verification process by moving it to a dedicated authenticate method, improving the code's efficiency and readability. This update likely enhances the performance of transaction processing by streamlining signature checks.

Changes

File Path	Change Summary
.../cosmos/cosmos-sdk	Moved signature verification out of a for loop and into the authenticate method.
.../x/auth/ante/sigverify.go	Refactored signature verification logic; extracted to authenticate function; renamed sigs to signatures.

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