[py] Add support for the new MicrosoftEdge (#7459)

Extracting Chromium from Chrome module. Have both Chrome and Edge
inherited from Chromium module. Add is_legacy parameter to launch
the new MicrosoftEdge.

Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/SeleniumHQ/selenium
Cr-Mirrored-Commit: 139ca6cddf95feb4446931c75f2bb7ce9ff83496
29 files changed