Feature/add format option

[joaoGMPereira]

Add ChartLabelFormat

Description

Add format enum, that you could set a custom format to titleLabel

Motivation and Context

I thought in this change, because some cases we need to show number with currency format

How Has This Been Tested?

I created 2 scenarios with custom format and none format, in custom format, I tested formatting number and return with text format, in none format, I tested if stay like was before.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Non-functional change (Updating Documentation, CI automation, etc..)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[joaoGMPereira]

Hey @AppPear how are you? I created this pr, with some improvement in how we could format value, Is my first pr, so if you have other ideia let me know.

Sorry for my english kkk..

[joaoGMPereira]

an example of how implements custom format:
CardView {
ChartLabel("Total", type: .subTitle, format: .custom(completion: { (value) -> String in
return "Total: (value.currencyFormat())"
}))
BarChart()
}