Flymake support

[thesimonho]

I made the assumption that because lsp-mode supports flymake, that lsp-ui would as well, but that doesnt appear to be the case

are there any plans for flymake support in this package? flymake feels a lot faster these days, and flycheck seems to introduce random pauses every few seconds on windows

[jcs090218]

You can try my packages, sideline + sideline-flymake. You can customize your own backends.