send vector element bits with external index header message

[var77]

Depends on lanterndata/lantern_extras#151

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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[github-actions]

Benchmarks

metric	old	new	pct change
recall (after create)	0.957	0.950	-0.73%
recall (after insert)	0.000	0.000	-
select tps	25542.784	23774.146	-6.92%
select bulk(100) tps	34.502	35.362	+2.49%
select latency (ms)	0.753 ± 1.970𝜎	0.822 ± 1.994𝜎	+9.16%
select bulk(100) latency (ms)	890.813 ± 147.687𝜎	896.368 ± 106.884𝜎	+0.62%
create latency (ms)	416754.051	410863.481	-1.41%
insert tps	443.743	448.634	+1.10%
insert bulk(100) tps	4.555	4.754	+4.37%
insert latency (ms)	71.440 ± 16.102𝜎	70.633 ± 15.203𝜎	-1.13%
insert bulk(100) latency (ms)	6892.286 ± 141.545𝜎	6190.757 ± 465.321𝜎	-10.18%
disk usage (bytes)	8192008192.000	8192008192.000	-