Adds an opt-in merge flag to the conversation custom attributes endpoint
so integrations can update only the keys they send instead of replacing
the whole hash, matching how the contacts endpoint already behaves. Also
adds a destroy_custom_attributes endpoint to remove specific keys,
mirroring the contacts convention. Replace stays the default, so
existing integrations are unaffected.
How to test
POST /conversations/:id/custom_attributes com { "custom_attributes":
{"a":1} }, then { "custom_attributes": {"b":2}, "merge": true } results
in {a:1, b:2}; no merge, results in {b:2}.
POST /conversations/:id/destroy_custom_attributes with {
"custom_attributes": ["a"] } removes only a.
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Co-authored-by: Vishnu Narayanan <iamwishnu@gmail.com>
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