Chemistry library cleanup

[DmitryVasilevsky]

• Remove use of old syntax (such as "term!")
• Add unit tests to cover more functions
• Cleanup use of complex numbers (pairs of double vs. dedicated type).
• Shorten names of functions, use namespace hierarchy
• Clear lints - "strict comparion of doubles"
• Move some functionality to standard library (Uniform superposition preparation, RangeAsIntArray)
• Move sample notebook and update it to reference published version of the library (on GitHub) Consider done for now, but we need to update it when we figure out how to support dev cycle

[DmitryVasilevsky]

Uniform superposition: #2195

[DmitryVasilevsky]

Removed old syntax, cleanup complex numbers, cleared lints, added some unit tests: #2202

[DmitryVasilevsky]

Major refactoring: #2208

[DmitryVasilevsky]

Sample notebook reference will be updated when we figure out how to support dev cycle.