Introduce ordering on column for table widget #2691

[myrdstom]

Description

Enable the sorting tool (ascending/descending) of records in the table widget

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

#2691

What is the new behavior?
Columns sorting enabled for widgets

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• Yes, and I documented them in migration notes
• No

Other useful information

[coveralls]

Coverage increased (+0.01%) to 83.094% when pulling 36f01eb on myrdstom:sort-table-widget into f9c6be6 on geosolutions-it:master.