Add read endpoints for service admins

[eleftherioszisis]

• Service admin can read any resource
• Service admin can read all assets, marked as deleted included as discussed in Allow retrieving all the assets of an entity (marked as deleted included) #358

[codecov]

Codecov Report

❌ Patch coverage is 93.64407% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
app/service/brain_atlas.py	50.00%	1 Missing ⚠️
app/service/calibration.py	50.00%	1 Missing ⚠️
app/service/consortium.py	50.00%	1 Missing ⚠️
app/service/contribution.py	50.00%	1 Missing ⚠️
app/service/emodel.py	50.00%	1 Missing ⚠️
app/service/measurement_annotation.py	50.00%	1 Missing ⚠️
app/service/memodel.py	50.00%	1 Missing ⚠️
app/service/morphology.py	50.00%	1 Missing ⚠️
app/service/organization.py	50.00%	1 Missing ⚠️
app/service/person.py	50.00%	1 Missing ⚠️
... and 5 more

Flag	Coverage Δ
pytest	96.42% <93.64%> (-0.12%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
app/repository/asset.py	100.00% <100.00%> (ø)
app/routers/admin.py	100.00% <100.00%> (ø)
app/routers/brain_atlas.py	100.00% <100.00%> (ø)
app/routers/calibration.py	100.00% <100.00%> (ø)
app/routers/cell_composition.py	100.00% <100.00%> (ø)
app/routers/circuit.py	100.00% <100.00%> (ø)
app/routers/consortium.py	100.00% <100.00%> (ø)
app/routers/contribution.py	100.00% <100.00%> (ø)
app/routers/electrical_cell_recording.py	100.00% <100.00%> (ø)
app/routers/electrical_recording_stimulus.py	100.00% <100.00%> (ø)
... and 69 more

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[mgeplf]

sucks to have so much duplication, but I suppose that's the best way; another layer of abstraction would probably bite us in the future.