150 improve unit test coverage for mapless mongo core

[sebastianconcept]

• Renamed project packages
• Added some unit tests
• Removed a deprecated unused class
• Adjusted some delays in time sensitive tests (for example the ones that depend on Redis PUBSUB)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 94.59459% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 83.57%. Comparing base (1c49597) to head (4367848).

Files	Patch %	Lines
src/Mapless-Base/Mapless.class.st	71.42%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #160 +/- ## ============================================ + Coverage 59.07% 83.57% +24.50% ============================================ Files 31 31 Lines 4222 3897 -325 ============================================ + Hits 2494 3257 +763 + Misses 1728 640 -1088 ```

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[sebastianconcept]

Is okay for you @paulwilke like this ? https://app.codecov.io/gh/sebastianconcept/Mapless/pull/160

We can do more in a next round