Add GE scanner physiological file functionality

[nw-duncan]

Functionality to read and process GE scanner physiological recording files is added to the tool.

Users can enter a single scanner generated file (with the name given to it by the scanner). Note that these do not have any suffix. If there are other files corresponding to other measurement modalities (i.e., PPG, respiration belt, or EKG) then these will be found automatically and added.

Proposed Changes

• New function to check if an input file has the filename convention of a GE file. If so all other relevant files are found and a ".gep" suffix appended to each (preserving the processing pipeline implemented for other supported file types)
• New function to read in the relevant files. This also adds a simulated trigger channel as GE scanners do not, to my knowledge, output such information natively
• All other steps proceed as with currently supported files

Change Type

• [ ] bugfix (+0.0.1)
• [x] minor (+0.1.0)
• [ ] major (+1.0.0)
• [ ] refactoring (no version update)
• [ ] test (no version update)
• [ ] infrastructure (no version update)
• [ ] documentation (no version update)
• [ ] Internal
• [ ] Testing

Checklist before review

• [x] I added everything I wanted to add to this PR.
• [x] [Code or tests only] I wrote/updated the necessary docstrings.
• [x] [Code or tests only] I ran and passed tests locally.
• [ ] [Documentation only] I built the docs locally.
• [x] My contribution is harmonious with the rest of the code: I'm not introducing repetitions.
• [x] My code respects the adopted style, especially linting conventions.
• [ ] The title of this PR is explanatory on its own, enough to be understood as part of a changelog.
• [x] I added or indicated the right labels.

• [ ] I added information regarding the timeline of completion for this PR.

• [x] Please, comment on my PR while it's a draft and give me feedback on the development!

[codecov[bot]]

Codecov Report

Merging #424 (319012a) into master (5606b46) will decrease coverage by 0.58%. The diff coverage is 81.11%.

@@            Coverage Diff             @@
##           master     #424      +/-   ##
==========================================
- Coverage   94.81%   94.22%   -0.59%     
==========================================
  Files           8        8              
  Lines         868      953      +85     
==========================================
+ Hits          823      898      +75     
- Misses         45       55      +10     

Impacted Files	Coverage Δ
phys2bids/io.py	93.20% <67.50%> (-6.20%)	:arrow_down:
phys2bids/utils.py	96.19% <90.47%> (-2.25%)	:arrow_down:
phys2bids/phys2bids.py	90.60% <100.00%> (+2.47%)	:arrow_up:
phys2bids/physio_obj.py	93.92% <100.00%> (ø)
phys2bids/viz.py	96.25% <0.00%> (+2.50%)	:arrow_up: