Add support for most recent search type

[dompuiu]

Description

For the new AJO disqualification feature, we need to support the new mostRecent search type. From a list of events, the mostRecent needs to return the index of the most recent event.

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[coveralls]

Pull Request Test Coverage Report for Build 14667216781

Details

• 36 of 38 (94.74%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 88.189%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/historical.ts	26	28	92.86%

Totals
Change from base Build 14317909451:	0.3%
Covered Lines:	799
Relevant Lines:	925

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💛 - Coveralls