[MAINTENANCE] Renaming Metric Name Suffixes using Enum Values for Better Code Readability

[alexsherstinsky]

Scope

The Metrics layer utilizes a naming scheme that corresponds to Map metrics, Condition metrics, Aggregate metrics, and others. These are properly delineated by Enum values with corresponding suffixes in ExecutionEngine module. However, in other Metrics modules, strings are used to designate Metric function types, which makes reading this already highly complex code even more difficult, unnecessarily. This effort improves the readability by using enums and meaningful variable names consistently.

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Changes proposed in this pull request:

• JIRA: GREAT-1347/GREAT-181/GREAT-1445

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[billdirks]

LGTM, thanks!