feat: Support for My NEAR Wallet

[lewis-sqa]

Description

• Sightly different approach to Feat: Add My Near Wallet to Selector #288. This instead wraps the existing NEAR Wallet implementation while overriding the important differences (id, metadata & walletUrl). Since My NEAR Wallet will become the supported wallet going forward, we've switched around the wrapping so NEAR Wallet wraps the new My NEAR Wallet implementation.
• Added support for accessing Options during wallet module setup.
• Simplified ExtraOptions interfaces for WalletConnect and My NEAR Wallet.

Checklist:

• I have performed a self-review of my own 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

Type of change.

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