Extend the set of valid characters allowed in JacksonEvent keys

[Subrahmanyam-Gollapalli]

Description

Extend the valid character set for JacksonEventKey and JacksonEvent keys
to include parentheses, percent and colon characters.
Updated validation logic and test cases in both JacksonEventKeyTest and
JacksonEventTest.

Issues Resolved

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has a documentation issue. Please link to it in this PR.
  • New functionality has javadoc added
• Commits are signed with a real name per the DCO

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[dlvenable]

I see these test failures:

CsvProcessorTest > test_when_ColumnNames_with_invalid_keys_parsedCorrectly() FAILED
    java.lang.AssertionError: 
    Expected: <true>
         but: was <false>

CsvProcessorTest > test_when_multLine_invalid_keys_then_parsedCorrectly() FAILED
    java.lang.AssertionError: 
    Expected: <true>
         but: was <false>

Maybe this test was relying on some invalid characters.

[dlvenable]

@Subrahmanyam-Gollapalli , It looks like some other tests are failing:

KeyValueProcessorTests > testInvalidKeyCharsReplacement() FAILED
    java.lang.AssertionError: 
    Expected: is <true>
         but: was <false>

You may benefit from running the following command locally to get faster feedback.

./gradlew --parallel build