Make TE allocation strictly following core number

[Andyz26]

Context

Update the allocation logic in TE so that the scheduler will only put the requested node into a TE strictly using the smallest CPU cores to avoid having TEs spreading in different container sizes. Also, introduce an intermediate allocation request contract to help eventual decoupling/removal of Mesos classes.

Checklist

• ./gradlew build compiles code correctly
• Added new tests where applicable
• ./gradlew test passes all tests
• Extended README or added javadocs where applicable

[github-actions]

Test Results

126 files  ±0  126 suites  ±0   6m 15s ⏱️ +32s
535 tests ±0  526 ✔️  - 1  8 💤 ±0  1 ❌ +1 
536 runs  +1  527 ✔️ ±0  8 💤 ±0  1 ❌ +1 

For more details on these failures, see this check.

Results for commit ff1ec66. ± Comparison against base commit 247ca97.

[github-actions]

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[fdc-ntflx]

LGTM!

[sundargates]

nit: What was the need to introduce a new type here?