Selenium like features?

- [X] I have checked that a similar [feature request](https://github.com/Genymobile/scrcpy/issues?q=is%3Aopen+is%3Aissue+label%3A%22feature+request%22) does not already exist.

- Yes, It maybe similar to #399 but not completly

**Is your feature request related to a problem? Please describe.**
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Yes, automation via scrcpy.
Something exactly like selenium, but for mobile

**Describe the solution you'd like**
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I need to automate some of my works which I should do via mobile. It would be awesome if we can get the events and send the events regarding the situation on the phone.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

Selenium like solution which can get xml and do the job.
**Additional context**
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First day using the scrcpy and pretty impressed, thank you.
Any kind of scripting is very helpful to my purpoe.

No files, tests, or entry points are named. Review the related issue #399 and existing feature-request discussions first, then clarify the automation interface, event retrieval and injection, and XML representation; done requires an agreed scope and acceptance criteria before implementation can begin.

Written by the indexing model from the issue text.