feat: add new `AsyncAnonymizedClient` using `arti-hyper`

[oleonardolima]

• add new async client, AsyncAnonymizedClient, that uses arti-hyper, and arti-client to connect and do requests over the Tor network.

fixes #61

Summary by CodeRabbit

• New Features
  • Added support for asynchronous operations in AsyncClient with multiple HTTP clients.
  • Introduced AsyncAnonymizedClient for anonymized requests using Tor.
  • Expanded esplora_client library for anonymized asynchronous communication over Tor.
• Chores
  • Updated dependencies including Tor-related and async utilities.
  • Adjusted test configurations for Rust projects and modified cache key generation in CI workflow.

[notmandatory]

Please rebase to pick up changes in #69 that fix CI.

[oleonardolima]

Most of the implementation is done, and it currently works on rust 1.70, also good to review and get inputs from it's being done.

But it does not work with our current MSRV, how do you usually go forward? just pin some of the dependencies?

cc @notmandatory @vladimirfomene

[coveralls]

Pull Request Test Coverage Report for Build 10686027379

Details

• 106 of 408 (25.98%) changed or added relevant lines in 4 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-16.3%) to 71.198%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
examples/tor.rs	0	16	0.0%
src/async.rs	104	123	84.55%
src/async_tor.rs	0	267	0.0%
<!--	Total:	106	408

Files with Coverage Reduction	New Missed Lines	%
src/lib.rs	1	97.08%
<!--	Total:	1

Totals
Change from base Build 10514244019:	-16.3%
Covered Lines:	1016
Relevant Lines:	1427

---

💛 - Coveralls

[notmandatory]

@oleonardolima can your rebase and rework this now that #75 is merged? hopefully not too big a change.

[coderabbitai[bot]]

Walkthrough

This update introduces Tor support to the rust-esplora-client and rust-electrum-client by integrating arti-hyper, enhancing privacy and anonymity features. It includes adjustments to continuous integration workflows and expands the library's capabilities with asynchronous operations and Tor communication via new feature flags and client structures.

Changes

Files	Change Summary
.github/workflows/...	Adjusted workflow configuration for Rust projects, including cache, toolchain setup, and testing.
src/async.rs	Extended AsyncClient to support asynchronous operations with Tor integration.
src/lib.rs	Expanded library to support anonymized async client with arti-hyper for Tor communication.

Assessment against linked issues

Objective	Addressed	Explanation
Add Tor support using arti-hyper with feature async-arti-hyper (#61)	✅
Utilize Arti features for HTTP-based requests integration, aligning with async streams (#61)	✅
Introduce async-arti-hyper feature flag for Tor support, maintaining compatibility with existing APIs (#61)	✅
Align implementation with existing APIs and usage patterns of rust-esplora-client (#61)	✅
Consider a long-term strategy for support of different transport layers using a consistent API approach (#61)	❓	It's unclear if a long-term strategy for transport layer support has been explicitly outlined.

This assessment concludes that the primary objectives have been largely met, with potential ambiguity regarding the strategic planning for future transport layer integrations.

---

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