tarantool / go-config / 22757529100

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collectors: add storage source with integrity support

Integrate go-storage library to enable reading configuration
from key-value stores (etcd) with integrity verification
through hash validation and signature checking.

- Add Storage collector implementing MultiCollector for
  reading multiple config documents under a common prefix
  with independent per-document merging.
- Add StorageSource data source for reading single config
  documents with integrity verification via the
  go-storage/integrity layer.
- Add Watcher interface to the collectors package for
  reactive change notifications from storage backends.
- Add RawBytesMarshaller for pass-through byte handling to
  avoid double-encoding when data is already serialized.
- Add MultiCollector interface to core config package for
  collectors that produce multiple independent documents.
- Update Builder to support MultiCollector by expanding
  each into sub-collectors with separate MergerContext
  instances.
- Extract shared tree-walking utilities into a common
  module for reuse across collectors.

Part of TNTP-5723

322 of 512 new or added lines in 8 files covered. (62.89%)

2263 of 2583 relevant lines covered (87.61%)

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