**What**
I have created a new method on the cart service which is `addLineItems`, allowing a user to add one or multiple items in an optimized way. Also updated the `generate` method from the line item service which now also accept a object data or a collection of data which. Various places have been optimized and cache support has been added to the price selection strategy.
The overall optimization allows to reach another 9000% improvement in the response time as a median (Creating a cart with 6 items):
| | Min (ms) | Median (ms) | Max (ms) | Median Improvement (%)
|---|:-:|---|---|---|
| Before optimisation | 1200 | 9999 | 12698 | N/A
| After optimisation | 63 | 252 | 500 | 39x
| After re optimisation | 56 | 82 | 399 | 121x
| After including addressed feedback | 65 | 202 | 495 | 49x
FIXES CORE-722
* feat: add feature flag loading in projects
* fix: make feature flag consume itself
* fix: rename container registration to featureFlagRouter
* fix: refactor
* behavioral feature flags
* add environment to server
* limit "useTemplateDb" to non feature flagged migrations
* filter migrations and entities according to those which are enabled in the environment
* run only migrations that are enabled when running 'medusa migrations run'
* add logging to the featureflag loader
* initial implementation of featureFlagEntity
* column descriptors
* initial startServerWithEnv (to be refactored)
* update commands
* final touches
* update loaders to fix unit tests
* enable all batch job tests
* update seed method
* add api test capabilities
* revert batch job test
* revert formatting changes
* pr feedback
* pr feedback
* remove unused imports
* rename feature flag decorators
* pr feedback
Co-authored-by: Sebastian Rindom <skrindom@gmail.com>
