[Appium] Support appium android

[YusukeHosonuma]

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.

Motivation and Context

Support the following newly.

• You can also use Appium action on Android. (with no warning)
• The appium_lib parameter can now be specified.

How to testing.

We prepared a repository for operation confirmation that use Appium via Fastlane.
https://github.com/YusukeHosonuma/AndroidAppiumViaFastlane

1. Clone repository. (git clone https://github.com/YusukeHosonuma/AndroidAppiumViaFastlane)
2. exec: bundle install (needs bundler)
3. exec: ./gradlew build
4. Launch android emulator. (needs android sdk)
5. exec: bundle exec fastlane appium_test (needs appium)
6. Please confirm that you succeed.

Description

• add android platform to is_supported
• add parameter :appium_lib to available_options

[KrauseFx]

That's great, thanks for your contribution @YusukeHosonuma 👍

[fastlane-bot]

Hey @YusukeHosonuma 👋

Thank you for your contribution to fastlane and congrats on getting this pull request merged 🎉
The code change now lives in the master branch, however it wasn't released to RubyGems yet.
We usually ship about once a week, and your PR will be included in the next one.

Please let us know if this change requires an immediate release by adding a comment here 👍
We'll notify you once we shipped a new release with your changes 🚀

[fastlane-bot]

Congratulations! 🎉 This was released as part of fastlane 2.68.1 🚀