Add custom color option in color picker

[arikfr]

(when picking a color for a chart series, for example)

We need to make sure that we use a single component for color picking across the application, so we don't have to redo this in every other visualization.

(Related: #2476)

[arikfr]

We go down this path we should probably show the user previously picked colors, so they can be consistent in their choices. This will implicitly implement #2481.

[arikfr]

#4136 implemented the component, we just need to make sure to use it everywhere now...

[arikfr]

@kravets-levko I guess we can close this now?

[kravets-levko]

@arikfr I think yes - color picker now has an input where user can type any color (in CSS hexadecimal format or predefined CSS constants like red/yellow/etc.)