Improve flecs benchmark integration

[ZeroErrors]

Fixes a couple issues with how flecs is integrated with the benchmarks. Namely:

• Updated options used in src/flecs/CMakeLists.txt
• Disabled timers and other unneeded modules in src/flecs/flecs/custom_flecs.h
• Modified flecs systems to take advantage of .iter(...) to avoid needing to fetch dt for each individual entity. Also reduced the number of arguments to the functions.
• Implemented bulk entity operations in src/flecs/flecs/entities/EntityFactory.h and enabled the benchmarks in benchmark/benchmarks/flecs-entities/FlecsEntityBenchmarkSuite.cpp
• Fixed a few cases where either incorrectly used HasBulkFeature instead of HasBulkFeatureWithOutput or was missing HasBulkFeatureWithOutput.
• Removed std::span usage from src/flecs/flecs/systems/DataSystem.h to match the implementation for other benchmarks.
• Fixed implementation of getOptionalComponentThree which previously was only calling get_mut which will add the component if it doesn't exist.
• Removed C++23 feature usage. Fixes C++23 features used but build target is C++20 #14