Cloning refactor and data race fix (#393)

* enzyme manager to avoid managing global state over the lifetime of a program

* clone_test -> clone to make it easier to test and bench

* remove concurrency

* remove todos

* expose some enzymes

* fix lint

* update changelog and remove pointer reciever.

* moved example test to separate file for namespace clarity in rendered go doc examples.

* renamed variables and added comments.

* renamed variables and removed unnecessary control block.

* added struct field name to changelog.

* Golden Gate is no longer a receiver

* update changelog


---------

Co-authored-by: Timothy Stiles <tim@stiles.io>

CHANGELOG.md

@@ -14,9 +14,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - `fastq` parser no longer becomes de-aligned when reading (#325)
 - `fastq` now handles optionals correctly (#323)
+-  No more data race in GoldenGate (#276)
+
+### Breaking
+- CutWithEnzymeByName is now a receiver of EnzymeManager. GoldenGate now takes an Enzyme instead of the name of an enzyme.
+This is an effort to remove dependence on some package level global state and build some flexibility managing enzymes
+over the lifetime of the program.
+- Enzyme.OverhangLen is now named Enzyme.OverhangLength
 
 ## [0.26.0] - 2023-07-22
 Oops, we weren't keeping a changelog before this tag!
 
 [unreleased]: https://github.com/TimothyStiles/poly/compare/v0.26.0...main
-[0.26.0]: https://github.com/TimothyStiles/poly/releases/tag/v0.26.0
+[0.26.0]: https://github.com/TimothyStiles/poly/releases/tag/v0.26.0