Update the style of the square buttons and add border radius in all buttons, inputs, selectors

[subashtiwari1010]

Description

This PR updates the style of the square buttons, and adds the border radius in button, inputs and selectors as per the requirement in #10954.

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:

Issue

What is the current behavior?
The buttons were categorized in small, medium and default size. And the components did not have the border radius to them.
Fixes #10954

What is the new behavior?
All the buttons are now categorized under square-button only. Other categories of square-button-md and square-button-sm are deprecated. Also, the border radius have been implemented in the button, inputs and select components.

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

[allyoucanmap]

@subashtiwari1010 I started to review the PR but not completed it yet. You can start to address the changes requested in this initial review, thanks

[allyoucanmap]

@subashtiwari1010 I just updated the branch with some changes, we still need:

• Check if all test are passing
• Add migration guide explaining the classes square-button-md and square-button-sm are deprecated and replaced by the class square-button

[allyoucanmap]

@ElenaGallo please test this enhancement on dev, thanks

[allyoucanmap]

@subashtiwari1010 after a test I noticed following problems:

• button groups in some cases was not rendering correctly

• Problem in spacing of forms (I don't think is directly connected to this one but it needs to be solved)

• Even if square-button-md and square-button-sm are deprecated we don't provide a fallback

I have already reviewed locally and I'll prepare a PR then I'll assign the review to you, thanks

[allyoucanmap]

@subashtiwari1010 here the PR to review #11961

[tdipisa]

@subashtiwari1010
New rounded buttons are very nice. At a very first look I only noticed this

This button seems not rounded. Is there some css still to align for this?

As you requested I report also the following which you confirmed is related. Thank you @subashtiwari1010

[subashtiwari1010]

Here is some issues in the filter widget: