[feature] Adding global sort order options

[kav]

Adding sort orders options. They are a bit verbose but do explain themselves rather well. I can update docs but given it's an optional param I didn't want to confuse new users in the initial example. Also added a test that covers all cases. In the event a user selects an order that matches postgres natural sorting we don't append the null ordering param to keep behavior consistant with existing functionality.

Fixes #124

[coveralls]

Pull Request Test Coverage Report for Build 8311285451

Details

• 9 of 9 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 89.72%

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Totals
Change from base Build 8079940929:	0.3%
Covered Lines:	280
Relevant Lines:	291

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💛 - Coveralls

[scheiblr]

Tank you very much. The code looks good to me.
Although, it is a more advanced feature, I would recommend to document it in a specific section at the bottom of the readme. What do you think?

If not already done, please apply prettier.

[kav]

I reverted my prettier run as it updated a bunch of unrelated changes but I'll give it a go and let you take a look, also adding docs at the bottom of the readme

[scheiblr]

please change the href in Postgrest supports specifying the position of nulls in sort [Ordering](https://postgrest.org/en/v12/references/api/tables_views.html#ordering). This can be configured via an optional data provider parameter: and let it link [sort ordering]. Thanks.

[scheiblr]

Thank you very much for the effort, looks good to me!