Replace regex dependency with stdlib re in FloJsonOutputCollector

[Copilot]

The CI was failing because FloJsonOutputCollector used the third-party regex library solely for its recursive pattern support ((?R)), which the standard re module lacks.

Changes

• Brace extraction: Replaced regex.findall(r'\{(?:[^{}]|(?R))*\}', ...) with a hand-rolled __find_balanced_braces() that walks the string tracking depth and string-literal boundaries — no external dep needed
• Bug fix: Guarded json_str[i - 2] in __strip_comments with an i < 2 bounds check to prevent index errors on short strings
• Q-promise memory API (from upstream PR Update flo_json_output_collector.py - To be Merged rootflo/wavefront#102):
  • rewind(callback, depth=None) — replays collected entries newest→oldest via recursive callback
  • iter_q(depth=None) — returns a FloIterator enabling while/for hybrid traversal
• Logger: get_logger().warn() → get_logger().warning() (deprecated alias removed)

Usage example

collector = FloJsonOutputCollector()
collector.append('{"a":1} // comment')
collector.append('{"b":2} /* comment */')

# Promise-style replay
collector.rewind(lambda entry: print("Q:", entry))
# Q: {'b': 2}
# Q: {'a': 1}

# While-for hybrid
it = collector.iter_q()
while it.has_next():
    for step in it.next():
        print("step:", step)

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