feat: Toast for tx lifecycle

[nicosampler]

Closes #252

Description: Add toast helpers for signing and executing a tx.

A new provider was added with three independent methods allowing watching when a signature is requested, when a tx is initiated, or simply to a particular tx hash.

Type of change:

• [x] New feature
• [ ] Bug fix
• [ ] Breaking change
• [ ] Enhancement
• [ ] Refactoring
• [ ] Chore

How Has This Been Tested?

• [ ] Manual testing
• [ ] Automated tests
• [x] Other (explain): I've tested using a fork of the dapp. Once this PR is merged, I can add it to the examples repo.

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