Adds ability to define a scope

[SpaNb4]

In this PR I added:

• an optional colScope and rowScope props to the table columns;
• background color for th elements in tbody so that the user can more easily identify the table headers;
• if the title for some th in thead is not specified, then I change th to td to fix the error
  Screenshot

  
  

So, by adding these props, we give developers an ability to improve accessibility in cases where the browser incorrectly determines the header cell type. And this, combined with other fixes, can help users with a screen reader to better understand and navigate through tables.

Examples that describe this a11y topic in more detail: Simple table, Table with two-level header

Without the scope attribute, tables that use rc-table may not meet the WCAG 1.3.1 success criteria.
Ref: https://www.w3.org/TR/WCAG20-TECHS/F91.html

[vercel]

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Name	Status	Preview	Updated
table	✅ Ready (Inspect)	Visit Preview	Oct 20, 2022 at 5:30PM (UTC)

[mellis481]

@afc163 Can we get this merged too please?

[codecov]

Codecov Report

Merging #859 (feaa987) into master (2c6f53d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #859   +/-   ##
=======================================
  Coverage   99.41%   99.41%           
=======================================
  Files          36       36           
  Lines        1017     1022    +5     
  Branches      304      307    +3     
=======================================
+ Hits         1011     1016    +5     
  Misses          6        6           

Impacted Files	Coverage Δ
src/Cell/index.tsx	99.10% <ø> (ø)
src/Body/BodyRow.tsx	97.91% <100.00%> (+0.04%)	⬆️
src/Body/index.tsx	100.00% <100.00%> (ø)
src/Header/Header.tsx	100.00% <100.00%> (ø)
src/Header/HeaderRow.tsx	100.00% <100.00%> (ø)

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[mellis481]

@zombieJ @afc163 Let's get this merged please.

[yhy-1]

@afc163 @zombieJ Hello, can you review this PR to solve accessibility issue please.

[mellis481]

@zombieJ @yoyo837 This PR adds some very valuable functionality. Can we get this merged?

[SpaNb4]

@zombieJ @yoyo837 Is there anything I need to add or change to this PR?

[SpaNb4]

@zombieJ It seems to me that CI has started to fail, but this is not due to my changes

[SpaNb4]

And I think the problem is somewhere in package-lock.json, because before reinstalling node_modules, npm run compile worked fine for me

[zombieJ]

Please check CI. CI / compile failed.

[SpaNb4]

Please check CI. CI / compile failed.

I see, but the problem is not on my side. You will see the same error on the master branch

[zombieJ]

OK. Let me handle this~

[zombieJ]

Update #891

[zombieJ]

+ rc-table@7.28.0

Please help to create PR on antd also : )