Basic SharedMap and SharedDirectory memory tests

[alexvy86]

Description

• Basic memory profiling tests for the SharedMap and SharedDirectory DDSes.
• Reorganize the test subfolder in the map package to accommodate memory-profiling tests.
  • Note that they are not ran together with mocha tests, mainly due to the fact that they could take noticeably longer than unit tests (they try to iterate as much as they can to bring a margin of error low enough).

Sample output of the tests:

Other information or known dependencies

Depends on https://github.com/microsoft/FluidFramework/pull/11296 and the @fluid-tools/benchmark package v0.42.0 being published first.

Internal task 956