Fix EZP-22128: Change license & copyright info to be in root of project

(cherry picked from commit 697607bacd6ea57bdcdb5a2f23262e6707100814)
Added standalone extension's composer.json

(cherry picked from commit b94ef8693c39994e44e7ab364036820bd8c58ceb)
Renamed composer package to ezwt-ls

(cherry picked from commit 268463496f29c0a753ad0b93694403f861e52c13)