CRD-Generator: Change format in @PrinterColum to enum

[baloo42]

Is your task related to a problem? Please describe

To align with the upcoming @AdditionalPrinterColumn annotation and to make this typesafe, the type of format in @PrinterColumn should be changed to an enum.

Describe the solution you'd like

enum PrinterColumnFormat {
    NONE(""),
    INT32("int32"),
    INT64("int64"),
    FLOAT("float"),
    DOUBLE("double"),
    BYTE("byte"),
    DATE("date"),
    DATE_TIME("date-time"),
    PASSWORD("password");

    public final String value;

    Format(String value) {
      this.value = value;
    }

    public String getValue() {
      return value;
    }
  }

This enum should be shared between @AdditionalPrinterColumn and @PrinterColumn.

Describe alternatives you've considered

Phase it out:

1. Add additional enum param formatStrict, deprecate format (with 7.0)
2. Replace format with enum param, deprecate formatStrict (with 8.0)
3. Remove formatStrict (with 9.0)

Additional context

First discussed here: #6390 (comment)

Note that this would be a breaking change.