[gnome-builder] (20 commits) ...README.md: add language server sections

[Christian Hergert <chergert src gnome org>]

Summary of changes:

  e5ba93c... libide/lsp: implement generic LSP server support (*)
  1762117... libide/plugins: handle extension factory failure (*)
  73f2bbe... plugins/bash-language-server: port to generic LSP plugin (*)
  39c8375... plugins/jedi-language-server: port to dynamic LSP plugin (*)
  e6b90d1... plugins/python-lsp-server: port to dynamic LSP plugin (*)
  914c52d... plugins/blueprint: port to dynamic LSP plugin (*)
  a627f5a... plugins/jdtls: port to generic LSP plugin (*)
  5ee85a4... libide/lsp: check for empty strings (*)
  08758c7... plugins/vala-language-server: port vls to generic LSP plugi (*)
  d2dcfe9... plugins/zls: add ziglang language server support (*)
  e43b014... plugins/clangd: port to generic LSP plugin (*)
  e30c210... plugins/intelephense: port to generic LSP plugin (*)
  f07bf7d... plugins/gopls: port to generic LSP plugin (*)
  fc3e0ea... plugins/rust-analyzer: port to generic LSP plugin (*)
  6bdc703... plugins/glsl-language-server: port to generic LSP plugin (*)
  301ac47... plugins/lua-language-server: port to generic LSP plugin (*)
  f7581f0... plugins/serve-d: port to generic LSP plugin (*)
  00e78cb... plugins/ts-language-server: port to generic LSP plugin (*)
  1aef2d3... build-aux: remove bundled language servers (*)
  f8a0209... README.md: add language server sections (*)

(*) This commit already existed in another branch; no separate mail sent