feat(messaging): Add Firebase installation ID (fid) support - #138
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…cate token - Message: add `fid` field; emit DeprecationWarning when `token` is used. - MulticastMessage: add `fids` field, make `tokens` optional, and validate at construction that at least one target is set and tokens+fids <= 500; emit DeprecationWarning when `tokens` is used. `to_messages()` expands both tokens and fids, suppressing the per-Message token warning. - serialize_message: enforce "exactly one of fid, token, topic or condition". - client: drop the now-redundant multicast count check (moved to construction). - Bump version to 6.2.0 and update README/CHANGES.
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Gera3dartist
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Message: addfidfield; emit DeprecationWarning whentokenis used.MulticastMessage: addfidsfield, maketokensoptional, and validate at construction that at least one target is set and tokens+fids<= 500; emitDeprecationWarningwhentokensis used.to_messages()expands both tokens and fids, suppressing the per-Message token warning.serialize_message: enforce "exactly one of fid, token, topic or condition".