major updates

[OkonSamuel]

This PR

1. gets rid of nrows method from the Schema display
2. update Schema constructor to reflect updates to Tables.Schema
3. modify show behavior of Schema object
4. make Schema object a Tables.jl compatible object, and
5. improve performance of schema and scitype methods for small to medium size tables
6. avoid schema errors for extremely wide tables.

Also partially address #137

[ablaom]

To do:

• [x] Review code coverage after upstream PR's are released
• [x] Boost coverage to 94% or better.

[ablaom]

Looks like there has been a drop in code coverage from 94% to 80%.

The revised schema.jl section is at only 66% : https://app.codecov.io/gh/JuliaAI/ScientificTypes.jl/blob/57f1c0e3d695283966a6bf1e4a8b8733bcd5b7a8/src/schema.jl

@OkonSamuel Could you have a look at adding a few pertinent tests to improve this?

[OkonSamuel]

Looks like there has been a drop in code coverage from 94% to 80%.

The revised schema.jl section is at only 66% : https://app.codecov.io/gh/JuliaAI/ScientificTypes.jl/blob/57f1c0e3d695283966a6bf1e4a8b8733bcd5b7a8/src/schema.jl

@OkonSamuel Could you have a look at adding a few pertinent tests to improve this?

@ablaom Okay, I'll take aa look at it today and add more tests.

[codecov-commenter]

Codecov Report

Merging #174 (57f1c0e) into dev (617bf2c) will decrease coverage by 14.52%. The diff coverage is 61.37%.

:exclamation: Current head 57f1c0e differs from pull request most recent head b299e87. Consider uploading reports for the commit b299e87 to get more accurate results

@@             Coverage Diff             @@
##              dev     #174       +/-   ##
===========================================
- Coverage   94.48%   79.95%   -14.53%     
===========================================
  Files           7        6        -1     
  Lines         290      424      +134     
===========================================
+ Hits          274      339       +65     
- Misses         16       85       +69     

Impacted Files	Coverage Δ
src/convention/scitype.jl	54.54% <51.94%> (-22.60%)	:arrow_down:
src/schema.jl	66.66% <64.13%> (-33.34%)	:arrow_down:
src/autotype.jl	96.00% <82.35%> (-4.00%)	:arrow_down:
src/ScientificTypes.jl	100.00% <100.00%> (ø)
src/coerce.jl	87.93% <100.00%> (+0.21%)	:arrow_up:

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[ablaom]

I've checked the very latest codecov report manually, which is back around 94%, so good to go.