Simplify setup using a rust-toolchain.toml file

[niluxv]

Description

This PR simplifies setup by using a rust-toolchain.toml file to specify required toolchain version and required components. Requires rustup version 1.23.0 (~ November 2020) or higher.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• API change with a documentation update
• Additional test coverage
• Code cleanup or just keeping up with the latest Rustc nightly

How Has This Been Tested?

Run setup.sh script and test that build/install still works.

Checklist:

• Fork the repo and create your branch from main.
• If you've added code that should be tested, add tests.
• If you've changed APIs, update the documentation.
• Ensure the test suite passes.
• Make sure your code lints.
• If you haven't already, complete your CLA here: https://code.facebook.com/cla

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[niluxv]

Ugh, actions-rs/toolchain doesn't support toml toolchain files yet, see actions-rs/toolchain#126. Doesn't seem like any PRs are going to be merged soon, so closing.