attach signer function call

[talhamalik883]

Description

BiconomySmartAccount class exposed a new function called "attachSigner," which enables developers to associate a signer at a later point before signing userOp.

When constructing userOps, developers can initially provide a VoidSigner instance with an identical address to the original signer. However, prior to userOp signing, it is necessary to provide the proper signer by using the "attachSigner" function.

Fixes # (issue)

Type of change

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• 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

How Has This Been Tested?

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Checklist:

• My code follows the style guidelines of this project
• 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
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[livingrockrises]

LGTM