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lua: use configured group name in application thread name

Currently, application threads are named `app<id>` where `<id>` is the
global thread identifier used internally. This makes it difficult to
figure out which group an application thread belongs to. In particular,
this complicates matching logged messages to application threads. Let's
name application threads `<group><id>` where `<group>` is the name of
the configured thread group and `<id>` is the identifier of the thread
in the group. We also change the meaning of the `thread_id` field
returned by `threads.info()`: now it shows the identifier of the thread
in its group instead of the global identifier used internally. We do it
for consistency with the new thread naming policy and the new `target`
option of `threads.call()` and `eval()` introduced recently.

Closes #12643

NO_DOC=experimental

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