Add more info to names() in Python API

[m-yac]

As touched upon in #1492, currently the remote API does not provide as much information about names as the browse command does in the REPL. This PR expands the result of the visible names method (i.e. names() in the Python API) to include:

• all the additional information provided by the browse command (i.e. what module the name is from, whether or not it is a parameter, and whether or it not it is a property), as well as
• fixity information (i.e. whether or not the name is an infix operator, and if so its associativity and precedence level).

This PR also adds the property_names and parameter_names functions to the Python API, which return only those names which are properties or parameters, respectively.

Finally, this PR also fixes a bug where names() would sometimes hang when a parameterized module is loaded.

See test_names.py for an example of this new output of names as well as the new the property_names and parameter_names functions.

Looking ahead: At some point it might also be nice to have type_names and module_names commands which return similar results to names, just for these other two distinct namespaces in Cryptol. It might also be nice to have an easy way to prove a property retrieved from property_names.

[RyanGlScott]

This looks reasonable to me, aside from one design question.

[m-yac]

This PR should be ready now. This last commit gives types to the output of names, property_names, parameter_names, and focused_module in the Python API as additional documentation for what sort of values these functions return (see the newly added CryptolNameInfo and CryptolModuleInfo in cryptoltypes.py).

Note that in making that change, I converted the type fields of the output of names() to CryptolSchemas for the first time, and found a bug where for unknown constructors, the arguments field wasn't getting converted to JSON.

[weaversa]

I realize I'm months late, but would it be easy to add the line number where the definition of the name appears to the info that's returned?