RFR: 7944: Reduce allocations of Double during chunk loading

[Richard Startin]

Using jmc-common as a library in a backend process we see high allocation rates of `Double` and have observed moderate performance improvements from this simple refactoring:
* Use primitive `double` in `ImpreciseScaleFactor`
* Use primitive `double` in `IScalarAffineTransformation.getOffset`
* Push multiplication of a scale factor down to a new method `ScaleFactor.scale(long multiplier)`
* Push `ScalarQuantity.in` down to `LongStored`/`DoubleStored` to avoid generalising over primitive types, when the `IQuantity` type can be varied instead.
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Commit messages:
 - JMC-7944: Reduce allocations of Double during chunk loading

Changes: https://git.openjdk.org/jmc/pull/436/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=436&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-7944
  Stats: 103 lines in 10 files changed: 47 ins; 28 del; 28 mod
  Patch: https://git.openjdk.org/jmc/pull/436.diff
  Fetch: git fetch https://git.openjdk.org/jmc pull/436/head:pull/436

PR: https://git.openjdk.org/jmc/pull/436