feat: launch WDA via devicectl object

[KazuCocoa]

BREAKING CHANGE: calls launch app process command with devicectl via this.device.devicectl.

This change will require https://github.com/appium/appium-xcuitest-driver/pull/2354.

After merging this, this lib will bump the major version. Then the xcuitest driver should bump the wda deps with the expected major version.

[github-actions[bot]]

:tada: This PR is included in version 8.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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