7903774: make all tests combinations printing nicer and/or configurable

[judovana]

This is still WIP, but already on row what CODETOOLS-7903774 suggested.

It will be finished once all desired output combinations are included, but already now is doing the usage of listing much more comfortable and code readable.

From:

`TESTS` - as introduced by https://github.com/openjdk/jcstress/pull/149
`COMBINATIONS` - as introduced in https://github.com/openjdk/jcstress/pull/149 verbose mode (thus surpassing the `-v` impact
`ALL_TESTS` - all tests as it was before https://github.com/openjdk/jcstress/pull/149
`COMBINATIONS_GROUPED ` - as suggested in https://github.com/openjdk/jcstress/pull/149#discussion_r1668678910
`COMBINATIONS_JSON` same as combinations, but a valid json
`COMBINATIONS_GROUPS` same as COMBINATIONS_GROUPED only instead of enumeration in each group, only count of members will be printed 

• TESTS are already implemented as ALL_MATCHING
• COMBINATIONS as ALL_MATCHING_COMBINATIONS
• ALL_TESTS as ALL

COMBINATIONS_GROUPED, and COMBINATIONS_GROUPS are under development.
The _JSON variants are tobe decided, but ability to JQL it sounds nice.

Suggestion to better names welcomed.

---

Progress

• Change must not contain extraneous whitespace
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Issue

• CODETOOLS-7903774: make all tests combinations printing nicer and/or configurable (Bug - P4)

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[mlbridge]

Webrevs

• 03: Full - Incremental (67b737ba)
• 02: Full - Incremental (a58cd140)
• 01: Full - Incremental (0a2e6c7a)
• 00: Full (d8a3644c)

[judovana]

Implemented
COMBINATIONS_GROUPED and COMBINATIONS_GROUPS (as MATCHING_GROUPS and MATCHING_GROUPS_COUNT) also with its inverted variants

The nice json will maybe need some refactorings. WIP on it, but any feedback appreciated

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