@spec build_request_from_template(map(), Keyword.t()) :: map()

Builds a LeaveGroup V0-V2 request by populating the request template with extracted fields. This is shared logic between V0-V2 requests as they have identical structure.

@spec build_v3_plus_request(map(), Keyword.t()) :: map()

Builds a LeaveGroup V3+ request (KIP-345 batch leave).

V3 introduces a structural change: the single member_id field is replaced with a members array. Each member in the array has:

• member_id (required)
• group_instance_id (optional, for static membership)

V4 is the flexible version (KIP-482) with the same logical fields -- Kayrock handles compact encoding.

Options

• group_id (required): The consumer group ID
• members (required): List of member maps, each with :member_id and optionally :group_instance_id

@spec extract_common_fields(Keyword.t()) :: %{
  group_id: String.t(),
  member_id: String.t()
}

Extracts common fields from request options (V0-V2).