Allow to specify options at find.Run() time

[maxgio92]

Motivation

As of now, options are all available at client creation time. Options, could be persisted through multiple runs, but each run might some option to be specific for the single run, such as file names or seed URLs.

Feature

Allow to specify options specific to single find runs, as wfind/pkg/find.Run() arguments.

Additional context

There are options that instead are likely to be needed across multiple search run, ilke HTTP client or network tuning parameters.