[Feature] Allow picking Months and Years

[ABausG]

Describe the feature you'd like Provide the option to specify a finestMode to pick Months/Years. When defining Month:

• Only changing years and Months is possible

When defining Year:

• Only changing years is possible

Use cases We have the use case at work where we want to pick just months/years. The returned date is then the First of the Month/January First