What changes were proposed in this pull request?

In the PR, I propose to extend Spark SQL API to accept java.time.Period as an external type of recently added new Catalyst type - YearMonthIntervalType (see #31614). The Java class java.time.Period has similar semantic to ANSI SQL year-month interval type, and it is the most suitable to be an external type for YearMonthIntervalType. In more details:

1. Added PeriodConverter which converts java.time.Period instances to/from internal representation of the Catalyst type YearMonthIntervalType (to Int type). The PeriodConverter object uses new methods of IntervalUtils:
   • periodToMonths() converts the input period to the total length in months. If this period is too large to fit Int, the method throws the exception ArithmeticException. Note: the input period has "days" precision, the method just ignores the days unit.
   • monthToPeriod() obtains a java.time.Period representing a number of months.
2. Support new type YearMonthIntervalType in RowEncoder via the methods createDeserializerForPeriod() and createSerializerForJavaPeriod().
3. Extended the Literal API to construct literals from java.time.Period instances.

Why are the changes needed?

1. To allow users parallelization of java.time.Period collections, and construct year-month interval columns. Also to collect such columns back to the driver side.
2. This will allow to write tests in other sub-tasks of SPARK-27790.

Does this PR introduce any user-facing change?

The PR extends existing functionality. So, users can parallelize instances of the java.time.Duration class and collect them back:

scala> val ds = Seq(java.time.Period.ofYears(10).withMonths(2)).toDS
ds: org.apache.spark.sql.Dataset[java.time.Period] = [value: yearmonthinterval]

scala> ds.collect
res0: Array[java.time.Period] = Array(P10Y2M)

How was this patch tested?

• Added a few tests to CatalystTypeConvertersSuite to check conversion from/to java.time.Period.
• Checking row encoding by new tests in RowEncoderSuite.
• Making literals of YearMonthIntervalType are tested in LiteralExpressionSuite.
• Check collecting by DatasetSuite and JavaDatasetSuite.
• New tests in IntervalUtilsSuites to check conversions java.time.Period <-> months.