Fix and improved TypeScript types

Hey, I am playing with some changes to the API that would fix https://github.com/FurqanSoftware/codemirror-languageserver/issues/14 and make it slightly better.

Renamed languageServerWithTransport to languageServerWithClient, and instead of accepting a transport, directly accept a client.
Moved the client property from languageServer options, so if the dev wants to pass a client, he can use languageServerWithClient.

Examples:

WebSockets transport

import { languageServer } from "codemirror-languageserver";

const lsPlugin = languageServer({
  serverUri, // WebSocket server uri.
  rootUri: "file:///",
  documentUri: `file:///${filename}`,
  languageId: "cpp", // As defined at https://microsoft.github.io/language-server-protocol/specification#textDocumentItem.
});

const view = new EditorView({
  state: EditorState.create({
    extensions: [
      // ...
      lsPlugin,
      // ...
    ],
  }),
});

Re using the same client

import { languageServer } from "codemirror-languageserver";

const client = new LanguageServerClient({
  transport: new WebSocketTransport(serverUri),
  rootUri: "file:///",
});

const firstView = new EditorView({
  state: EditorState.create({
    extensions: [
      // ...
      languageServerWithClient({
        client,
        documentUri: `file:///${secondFileName}`,
        languageId: "cpp",
      }),
      // ...
    ],
  }),
});

const secondView = new EditorView({
  state: EditorState.create({
    extensions: [
      // ...
      languageServerWithClient({
        client,
        documentUri: `file:///${firstFileName}`,
        languageId: "cpp",
      }),
      // ...
    ],
  }),
});

Custom transport

import { languageServer } from "codemirror-languageserver";

const client = new LanguageServerClient({
  transport: new AwesomeCustomTransport(),
  rootUri: "file:///",
});

const lsPlugin = languageServerWithClient({
  client,
  documentUri: `file:///${filename}`,
  languageId: "cpp",
});

const view = new EditorView({
  state: EditorState.create({
    extensions: [
      // ...
      lsPlugin,
      // ...
    ],
  }),
});

Thoughts?

FurqanSoftware / codemirror-languageserver

Fix and improved TypeScript types #18

WebSockets transport

Re using the same client

Custom transport