Expose auth providers from `taco`

[piotr-roslaniec]

Type of PR:

• Feature

Required reviews:

• 2

What this does:

• decrypt method in taco now takes authProvider: EIP4361 instead of signer: ethers.Signer
• Exposes EIP4361Provider from taco rather than taco-auth to avoid fragmenting TACo API across multiple packages. To be reassessed when/if we publish taco-auth
• Users can now modify SIWE parameters in EIP4361Provider

Issues fixed/closed:

• Fixes https://github.com/nucypher/taco-web/issues/533

Why it's needed:

Explain how this PR fits in the greater context of the NuCypher Network. E.g., if this PR address a nucypher/productdev issue, let reviewers know!

Notes for reviewers:

• Fails on Lynx because of incompatibility with v7.3.0

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