[BUG]Autohistogram date proto has wrong names, so bucket and min interval are ignored

[baroquebobcat]

Describe the bug

existing

kaldb/astra/src/main/proto/astra_search.proto

Lines 124 to 129 in 9125b7f

	message AutoDateHistogramAggregation {
	// Value representing the minimum interval of the bucket size (ie, day, hour)
	Value min_interval = 1;
	// Exact number of buckets required
	Value num_buckets = 2;
	}

sketched in my benchmarking branch
https://github.com/airbnb/kaldb/pull/37/files#diff-0adcf7b903b4ad34cbfad21f50b2db7b0a8469b588fe72ac94bcda357ac0fb7eR126-R135

Requirements (place an x in each of the [ ])**

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've searched for any related issues and avoided creating a duplicate issue.

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