feat(FSADT1-1524): added legacy predictive search

[paulushcgcj]

Description

Adding legacy predictive query search and API. It should search on the legacy database using a query that will rank the results based on the scoring system provided through the confluence page documentation.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• New integrated tests

Checklist

• I have read the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

Further comments

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Current changelog

Features

• FSADT1-1524: added legacy predictive search (0e631aa)

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