feat: add support for apple silicon

[dmccaffery]

• update prompt-install to detect and handle prompt installation for
  apple silicon (arm64e) architecture
• install homebrew used to manage rosetta 2 installations (x86_64) in
  /usr/local
• install homebrew used to manage native installations (arm64e) in
  /opt/homebrew
• introduce brew-intel and brew-arm aliases to enable management of
  both installations regardless of the architecture of the current shell
• update use-shell to detect arm64e native shells
• fix an issue where the PATH variable is reordered by invalid
  path_helper invocations
• normalise and fix areas where the PATH variable is modified
• normalise eval invocations (such as completions)
• remove completion check for gulp and grunt, which are largely obsolete
• fix an issue where it was assumed that gpg was available
• add end-to-end tests for Windows 2019 under WSL 1
• add end-to-end tests for all validated linux distributions
  • create a non-root user
  • add user to sudoers
  • install gosu
  • use gosu to invoke installs and tests under non-root user
• update VERSION logic in prompt-install / update to support the next
  branch and any future branches
  • this should be improved in the future to correctly recommend updates
    based on semver tags (or the branch/channel used to install prompt)

Closes: #61, #64, #66, #69

NOTE:

Homebrew, which we rely heavily on, does not yet officially support
apple silicon. In addition, very few formulae include bottles (pre-compiled)
binaries for the SoC. As a result, most formulae must be compiled from
source. Many formulae do not yet successfully compile for apple silicon
and so we must gracefully fallback to their x86_64 counterparts.

The following methodology is used to support prompt on apple silicon
macs:

1. install homebrew instance for intel/rosetta (x86_64) under /usr/local
2. detect apple silicon (arm64e) and install homebrew instance in
   /opt/homebrew
3. attempt to install all tools included with prompt natively in
   /opt/homebrew
4. install all tools included with prompt under rosetta in /usr/local
5. ensure /opt/homebrew is prioritised in the PATH variable

The above methodology will enable native tools if and when they are
available and working with apple silicon. Tools that are not available
and/or fail will fallback to the rosetta versions. This enables a
seamless experience for apple silicon users.

[dmccaffery]

@sjk07 @patrickserrano : all scenarios are now passing including tests across all platforms! Let me know if you see anything that needs to be addressed.

Also, evidence that prompt works perfectly on apple silicon both natively and in rosetta 2:

NOTE: at present prompt will always default to using native apps over rosetta counterparts, which is why the fully-qualified paths to /usr/local/bin are being used. I have yet to run into an issue with any app that successfully compiles for arm64e so defaulting to native seems to be best for performance.

[sjk07]

@dmccaffery Why chose the name hack, I'm curious?

[dmccaffery]

don't actually understand the reasons for this, but its a growing trend in many of the OSS projects I participate in, mostly in the golang world. Probably a direct result of Kubernetes doing it:

https://github.com/kubernetes/kubernetes/tree/master/hack

[sjk07]

@dmccaffery this is awesome stuff! I don't have an M1 chip so you're going to have to be the sole maintainer for this stuff atm 😄

@patrickserrano Is there anything WSL side locally that you want to check? Also we should add some of the new functionality to the readme / #63

if not then... LGTM!

[dmccaffery]

I added a test for the issue Patrick saw as well as a WSL 1 e2e build, so I think it's fully resolved. If someone on Windows wants to validate that, I'd be happy. :)

[github-actions]

🎉 This PR is included in version 8.2.0-next.1 🎉

The release is available on GitHub release

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