Format and Formula support for counter widget

[tdipisa]

Description

The support for Format and Formula adv. options should be included also for Counter widgets.

What kind of improvement you want to add? (check one with "x", remove the others)

• Minor changes to existing features
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Other useful information

[MV88]

@tdipisa @offtherailz please clarify

by checking the current implementation i noticed that:

• the format and formula are applied to Y axis labels of widgets chars (bar and line) only (also pie after this Advanced options for Pie Chart widget #9072 )
• y axis is non existing in counter widgets

MapStore2/web/client/components/charts/WidgetChart.jsx

Lines 530 to 534 in caaa908

	* @prop {object} [yAxisOpts] options for yAxis: `type`, `tickPrefix`, `tickPostfix`, `format`, `formula`
	* @prop {string} [yAxisOpts.type] determine the type of the y axis of `date`, `-` (automatic), `log`, `linear`, `category`, `date`.
	* @prop {string} [yAxisOpts.format] format for y axis value. See {@link https://d3-wiki.readthedocs.io/zh_CN/master/Formatting/}
	* @prop {string} [yAxisOpts.tickPrefix] the prefix on y value
	* @prop {string} [yAxisOpts.tickSuffix] the suffix of y value.

• But here is requested to add this to the counter. I think what you want here is to manipulate the value of the counter by adding a prefix suffix or using a formula on top of it.
• Also what about the unit of measure currently applied to the value that act as a suffix
  do we have to remove it and "include it" in the format part?
  

for example that fields makes sense on widget bar chart because they are applied to the y axis

this could be a result of adding prefix and suffix

[MV88]

As agreed we are going to apply those advanced settings to the value of the counter,
this should be stored in a different section of the data of the widget,
since they are not referring to the yAxisOpts as they affect directly value