Add option to `AmqpInboundChannelAdapter` ot override default `amqp_batchedHeaders` name to something else

[artembilan]

The new setter is:

	/**
	 * Set a header name containing {@code List<Map<String, Object>} headers when batch mode
	 * is {@link BatchMode#EXTRACT_PAYLOADS_WITH_HEADERS}.
	 * Defaults to {@link #CONSOLIDATED_HEADERS}.
	 * @param headerNameForBatchedHeaders the name of header
	 * containing {@code List<Map<String, Object>} headers when batch mode
	 * is {@link BatchMode#EXTRACT_PAYLOADS_WITH_HEADERS}.
	 * @since 6.4
	 */
	public void setHeaderNameForBatchedHeaders(String headerNameForBatchedHeaders) {
		Assert.hasText(headerNameForBatchedHeaders, "'headerNameForBatchedHeaders' must not be empty");
		this.headerNameForBatchedHeaders = headerNameForBatchedHeaders;
	}