Cleans implicit imports + Add ExplicitImports quality assurance testsuite

[navidcy]

Closes #229

[codecov]

Codecov Report

❌ Patch coverage is 55.88235% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/SeaIces/freezing_limited_ocean_temperature.jl	0.00%	3 Missing ⚠️
...c/DataWrangling/OSPapa/OSPapa_flux_observations.jl	0.00%	2 Missing ⚠️
.../DataWrangling/OSPapa/OSPapa_ocean_observations.jl	0.00%	2 Missing ⚠️
src/DataWrangling/metadata_field_time_series.jl	50.00%	2 Missing ⚠️
src/Lands/prescribed_land.jl	60.00%	2 Missing ⚠️
src/Radiations/prescribed_radiation.jl	60.00%	2 Missing ⚠️
src/Atmospheres/prescribed_atmosphere.jl	75.00%	1 Missing ⚠️
src/DataWrangling/metadata.jl	0.00%	1 Missing ⚠️

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[navidcy]

@giordano I tried to follow Oceananigans practices. The tests pass here now. Could you have a look? There is a chance I misunderstood something.

I am a bit confused because I was thinking that the end goal would be that there is no import ... whatsoever.

[navidcy]

8497c2a tried to have all extension of methods explicit.

[giordano]

For what is worth, the way I go when I want to implement ExplicitImports is to run

using ExplicitImports, MyPackage
print_explicit_imports(MyPackage)

or

using ExplicitImports, MyPackage
print_explicit_imports(MyPackage.Submodule)

if MyPackage is very large, and working on a submodule-basis is more efficient (that's what I've been doing in Oceananigans). This is the recommended approach in the docs and is quite nice because it shows you exactly what's needed to change, and how to change it. Then I use some judgement (for example it always suggests using AnotherPackage: AnotherPackage, even if not actually needed, I think as a precaution), but I have some good guidance.

[navidcy]

I've done it... I believe this is ready to merge?
I haven't cleaned all extensions.