Add vendor folder to lsp-file-watch-ignored-directories

[takeokunn]

For programming languages like PHP and Ruby, the libraries are located in the vendor/ directory.

[yyoncho]

vendor is too generic, I would rather not put it in the default set.

[elken]

vendor is too generic, I would rather not put it in the default set.

What about per-mode lists? Maybe an alist?

[seagle0128]

Agree. It's too generic.

[ericdallo]

The per-mode list sounds like a good idea to me, would it be hard to implement @yyoncho ?

[yyoncho]

We can use after open function to set buffer local or put the specific filters in the lsp--client