feat: Support reading dictionary files over http.

[Jason3S]

Related to #236

Example json

{
    "dictionaryDefinitions": [
        {
            "name": "cities-remote",
            "path": "https://github.com/streetsidesoftware/cspell/raw/main/packages/cspell-io/samples/cities.txt.gz",
            "type": "W"
        }
    ],
    "dictionaries": ["cities-remote"]
}

Limitation

• Note: the @cspell/eslint-plugin cannot support remote dictionaries because eslint only supports synchronous linting of files. At the moment, an eslint-plugin cannot use any async methods. Reading data over http can only be done in an async fashion.
• addWords dictionary option is not supported for remote dictionaries. It is not clear how to update the remote source.