Pseudo form description language for Autofill

The idea is to create a pseudo language that describes precisely the fields of a form to be filled according to an application or a URL.

This pseudo language will generate a configuration file that can be interpreted by the Autofill algorithm to fill in the forms more efficiently.

No files, tests, or entry points are named. Start by locating the Autofill algorithm and determining how a pseudo-language description and generated configuration would be represented and interpreted. Done means the language syntax, configuration format, and integration behavior are defined and implemented.

Written by the indexing model from the issue text.