Added lazy operations (#27)

* First draft of lazy operations

* Sorting lazy vectors

* Update README.md

* Added lazy zip

* Update README.md

* added lazy_set

* added missing lazy_set overload

* lazy_set set algebra added

* added lazy map implementation

* Added contents table in README

* Update README.md

* fixed header ordering

* header cleanups

* Fixed PR comments

* Fixed lazy_set and lazy_map ownership

* fixed release builds asserts

* fixed set comparator and dead code

* Fixed map comparator and removed dead code

* lazy set algebra operations normalization

* assert for release builds

Finalized functional map (#26)

* first commit for map

* StdMapConstructor

* InitializerList ctor and is_empty()

* access operator

* clear

* contains

* removed some tests

* Finalized map implementation

* Update cmake.yml

* fixed strict comparator crash

* Revert "Merge branch 'main' into functional_map"

This reverts commit 223b54c, reversing
changes made to 88c8381.

* Updated GoogleTest to V.1.17 and fixed CMake warnings/errors

* revertred changes to optional

* reverted changes to set

* reverted changes to vector

* reverted changed to optional_test

* reverted vector_test

* reverted .gitignore

* Update CMakeLists.txt

* CMakeLists to 3.10 and GoogleTests to 1.12.1

* Update CMakeLists.txt

* replaced std::less_equal with std::less (strict comparator)

* std::greater_equal (strict comparator)

* removed map_keys and map_values

* comment

* Update README.md

* Update README.md

* cleaned up documentation

* docs update pass

* final docs pass

Update README.md for reduce