fix: WalletConnect commonjs support.

[paouvrard]

Description

Fix commonjs build error when using wallet-connect package:

var modal = require('@walletconnect/modal');
Error [ERR_REQUIRE_ESM]: require() of ES Module /Users/pa/aurora-is-near/rainbow-bridge-next/node_modules/@near-wallet-selector/wallet-connect/node_modules/@walletconnect/modal/dist/index.js from /Users/pa/aurora-is-near/rainbow-bridge-next/node_modules/@near-wallet-selector/wallet-connect/index.cjs not supported.
Instead change the require of index.js in /Users/pa/aurora-is-near/rainbow-bridge-next/node_modules/@near-wallet-selector/wallet-connect/index.cjs to a dynamic import() which is available in all CommonJS modules.

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.

• FIX - a PR of this type patches a bug.
• FEATURE - a PR of this type introduces a new feature.
• BUILD - a PR of this type introduces build changes.
• CI - a PR of this type introduces CI changes.
• DOCS - a PR of this type introduces DOCS improvement.
• STYLE - a PR of this type introduces style changes.
• REFACTOR - a PR of this type introduces refactoring.
• PERFORMANCE - a PR of this type introduces performance changes.
• TEST - a PR of this type adds more tests.
• CHORE - a PR introduces other changes than the specified above.

[Patrick1904]

LGTM

[vikpande]

@paouvrard , good to go.