Improve the iterate seek to O(logN)

[nolouch]

Hi, In our scenario, we frequently use the iterate, and the Less compare is expenses when key is large. This PR mainly improve the iterate location. uses binary search to quickly locates the start item. before:

BenchmarkSeek-4          3000000               452 ns/op
BenchmarkSeek-4          3000000               513 ns/op
BenchmarkSeek-4          3000000               454 ns/op
BenchmarkSeek-4          3000000               450 ns/op

after:

BenchmarkSeek-4         10000000               225 ns/op
BenchmarkSeek-4         10000000               222 ns/op
BenchmarkSeek-4         10000000               223 ns/op
BenchmarkSeek-4         10000000               224 ns/op

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

:memo: Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here (e.g. I signed it!) and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

[googlebot]

CLAs look good, thanks!

[nolouch]

PTAL @gconnell

[gconnell]

Thanks!