feat(pg): add cfg memory control to driver

[mistahj67]

Description

Plumb memory limit config support for the postgres driver

Motivation and Context

Currently pg driver hardcodes the memory limit for queries to 1Gb

How Has This Been Tested?

Updated build.config.json on BHE side and verified the limit was reflected in dawgs queries

Screenshots (if appropriate):

Types of changes

• Chore (a change that does not modify the application functionality)
• 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)

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