* [IE TESTS] GatherTree op ref function has been created.
* [IE TESTS] Added GatherTree single layer test
* [IE TESTS] Fixed code styles.
* [IE TESTS] GatherTree test FP32 precion was enabled.
* [IE TESTS] Refactoring of Builder::makeConstatn procedure
The refactoring is aimed at managing the range of random data for the constants initialization procedure.
* [IE TESTS] GatherTree test was extended with constants
* [IE TESTS] GatherTree ref rewritten to non-templated function.
* [IE TESTS] GatherTree test inp shape indx enum removed.
* Revert "[IE TESTS] Refactoring of Builder::makeConstatn procedure"
This reverts commit 2648172e00ccca266d39e8775b890b8a8395f57c.
* [IE TESTS] makeConstant was augmented with random data range parameters.
* [IE TESTS] GatherTree test was rewritten using makeConstant function.
* [IE TESTS] GaterTree test call templated makeConstant
* [IE TESTS] GaterTree test code style fix