Adds new features to Ion Data Generator to process constraints of Timestamp, Clob/Blob and Decimal.

[linlin-s]

Description of changes: In this pull request, more features were added to support Ion Data Generator to process more constraints provided by Ion Schema. The supported Ion Schema constraints in this PR includes:

• Timestamp:

  timestamp_precision:<RANGE<TIMESTAMP_PRECISION_VALUE>>

• Decimal:

  precision: <INT>
  precision: <RANGE<INT>>
  scale: <INT>
  scale: <RANGE<INT>>

• Clob/Blob:

  byte_length: <INT>
  byte_length: <RANGE<INT>>

1. IonSchedmaUtilities.java

• Adds logic to process timestamp_precision:<RANGE> to the method IonSchemaUtilities.parseConstraints.
• Adds method IonSchedmaUtilities.checkValidationOfSchema to check the validation of input ion schema file.

2. WriteRandomIonValues.java

• Adds method WriteRandomIonValues.writeRandomDecimalsFromSchema which is able to process the constraints of decimal.
• Adds method WriteRandomIonValues.writeRandomTimestampsFromSchema which is able to process the constraints of timestamp.
• Adds parameter constraintStruct to method WriteRandomIonValues.writeRandomLobs to allow the method to process the constraints of clob.
• Add method WriteRandomIonValues.constructDecimalFromSchema which is able to construct the decimal conforming with the constraints in Ion Schema.

Test:

• Adds two ISL file (testTimestamp.isl, testDecimal.isl, testClob.isl, testBlob.isl) as inputs to test the Ion Data generator.
• Adds methods to test whether there is violation when generating timestamps , clobs, blobs, and decimals.

Commits history reference: https://github.com/linlin-s/ion-java-benchmark-cli/pull/8

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