Add ZeroMap

[Manishearth]

TBD:

• Benches
• Nicer .get() for ULE types

Part of #652

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[codecov-commenter]

Codecov Report

Merging #668 (650e8fb) into main (7d78c20) will increase coverage by 0.11%.
The diff coverage is 81.92%.

@@            Coverage Diff             @@
##             main     #668      +/-   ##
==========================================
+ Coverage   74.13%   74.24%   +0.11%     
==========================================
  Files         167      171       +4     
  Lines       10627    10824     +197     
==========================================
+ Hits         7878     8036     +158     
- Misses       2749     2788      +39     

Impacted Files	Coverage Δ
utils/zerovec/src/lib.rs	100.00% <ø> (ø)
utils/zerovec/src/zerovec/mod.rs	67.00% <54.54%> (-1.54%)	⬇️
utils/zerovec/src/map/kv.rs	64.70% <64.70%> (ø)
utils/zerovec/src/map/serde.rs	81.96% <81.96%> (ø)
utils/zerovec/src/map/vecs.rs	85.10% <85.10%> (ø)
utils/zerovec/src/map/mod.rs	92.50% <92.50%> (ø)
utils/zerovec/src/varzerovec/mod.rs	60.60% <100.00%> (+1.58%)	⬆️
utils/zerovec/src/varzerovec/components.rs	81.48% <0.00%> (-2.57%)	⬇️
utils/zerovec/src/ule/plain.rs	0.00% <0.00%> (ø)
... and 5 more

---

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[coveralls]

Pull Request Test Coverage Report for Build b01b7be3b1f350f5f2ca3f55ac2cedbdd5c9a411-PR-668

• 145 of 177 (81.92%) changed or added relevant lines in 6 files are covered.
• 8 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.1%) to 73.492%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
utils/zerovec/src/map/mod.rs	37	40	92.5%
utils/zerovec/src/zerovec/mod.rs	6	11	54.55%
utils/zerovec/src/map/kv.rs	11	17	64.71%
utils/zerovec/src/map/vecs.rs	40	47	85.11%
utils/zerovec/src/map/serde.rs	50	61	81.97%

Files with Coverage Reduction	New Missed Lines	%
utils/zerovec/src/varzerovec/mod.rs	1	60.61%
utils/zerovec/src/ule/plain.rs	2	0%
utils/zerovec/src/varzerovec/components.rs	5	81.48%

Totals
Change from base Build 6daf09323a50001967fcabd778d96aa9176f3cc5:	0.1%
Covered Lines:	8162
Relevant Lines:	11106

---

💛 - Coveralls

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• utils/zerovec/src/varzerovec/mod.rs is different
• utils/zerovec/src/zerovec/mod.rs is different

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• utils/zerovec/src/map/vecs.rs is different

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[sffc]

LGTM! But please fix the lint error