DIE physiological.py DIE (electrodes import refactor) (PR 2)

[MaximeBICMTL]

Builds on #1508 (diff)

Description

Refactor electrodes.tsv import to use the ORM database abstraction, good layering in loris_bids_utils, loris_core lib, loris_bids_importer, and typed code.

A notable design change is that the previous code proceeded in this order:

1. Import electrodes.
2. Import coordinate system.
3. Associate electrodes to their coordinate system.

But this design is not ideal, because if step 2 fails, then electrodes are left without link to their coordinate system (and thus their acquisition file given the current table architecture).

The new import order is:

1. Import coordinate system.
2. Import electrodes and link them to that coordinate system.

This order is simpler, more error-resilient, and easier to extend to other modalities like MEG (which is currently not integrated with coordinate systems yet).

This PR notably finally gets rid of physiological.py, which is a very good thing that we should celebrate. The table design is still horrendous but that can now be more easily improved on after this PR.