Enhance plugin-hash to allow callers to optionally pass values for size, smallerSize in ImagePHash

[thekaleidoscope]

Is your feature request related to a problem? Please describe.
The pHash functionality from plugin-hash althought allows control on specificity of uniqueness of pHash with size and smallerSize in constructor of ImagePHash, the exported methods like pHash call the ImagePHash without any constructor argument forwarded from client.

Describe the solution you'd like
Add optional params to exported method signatures like pHash<I extends JimpClass>(image: I, options?: {size?: number, smallerSize?: number})