feat: support targeting browser in login command

[aemounib]

What does this PR do?

Add support for targeting browser in login command

What issues does this PR fix or reference?

forcedotcom/cli#1465

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @aemounib to sign the Salesforce.com Contributor License Agreement.

[cristiand391]

Hey @aemounib 👋🏼 , I left some minor suggestions but this looks great!

[aemounib]

Thanks for the review, the suggestions have been implemented.

[RodEsp]

QA

✔️ Running auth:web:login --browser edge opens a windows on Edge

✔️ Running auth:web:login --browser chrome opens a windows on Chrome

✔️ Running `auth:web:login --browser firefox` opens a windows on Firefox

✔️ Running auth:web:login without the --browser flag uses my default browser

❌ If Firefox isn't installed and you run auth:web:login --browser firefox the command just hangs indefinitely. I assume the same happens for the other browsers. If possible, it should print an error stating the chosen browser isn't available and then exit. @cristiand391, do you think we should do this as a separate PR or fix it in this one?

[cristiand391]

@RodEsp I tried running sfdx force:org:open -u <org> --browser edge (I don't have Microsoft Edge installed) and it continues successfully instead of failing, I looked at how open works and seems it depends on which OS you are running it will use different commands to open the browser.
https://github.com/sindresorhus/open/blob/main/index.js#L105

I'm ok with fixing this in a a separate PR since we will need to do it on plugin-org too and should work on all platforms. 👍🏼

[RodEsp]

Thanks for the contribution @aemounib!

[RodEsp]

Btw, I created this issue, forcedotcom/cli#1830, to track the failed QA and marked it with the help wanted tag.
And I started this PR, #551, for a fix but there is still an issue with the CLI not exiting. If you want to give it a shot @aemounib it would be most appreciated!

[aemounib]

@RodEsp For sure. I will give it a shot, thanks.