tarantool / go-config / 25093563529

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tarantool: derive env-var paths from JSON schema

The previous TT_* env-var transform split names on '_' and silently
dropped any compound key the schema defines (audit_log, wal_queue_max_size,
iproto.listen, …). With a JSON schema in hand the builder now walks
the schema once into a trie and resolves env names by greedy
longest-prefix match, falling back to the wildcard child for
additionalProperties / patternProperties so groups/<name>/replicasets/<name>/…
works.

Vars that don't match any schema path are silently dropped instead of
written to bogus keys. Without a schema (WithoutSchema) the legacy
naive split is preserved verbatim.

Related to TNTP-7385

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