(feature): Add IRv53; float type

[amckinney]

This introduces IRv53 which is similar in spirit to IRv52 (re: #4102), but adds the float primitive type.

To prevent future breaking changes, this also adds a separate key, value pair for every PrimitiveType (in both the v1 and v2 variants), which is shown below:

types:
  PrimitiveTypeV2:
    union:
      integer: IntegerType
      long: LongType
      uint: UintType
      uint64: Uint64Type
      float: FloatType
      double: DoubleType
      boolean: BooleanType
      string: StringType
      date: DateType
      dateTime: DateTimeType
      uuid: UuidType
      base64: Base64Type
      bigInteger: BigIntegerType
  ...

  FloatType:
    properties: {}

  ...

Any of the types that do not yet support default values or validation rules are defined as an empty object so that we can add to them in a backwards compatible manner. We also assign a name (rather than an in-lined {}), which makes it even easier for generators later on.