#159236196 Cache nutritional plan values

[Yiga-fred]

What does this PR do?

Cache for nutritional plan values.

Description of Task to be completed?

Enable caching for nutritional plan values.
Have the cache key deleted every time a NutritionPlan, Meal, and MealItem is added, edited or deleted.

How should this be manually tested?

• Git clone project, https://github.com/andela/wg-wits

• Checkout to branch ft-cache-nutritional-values-159236196

• Create a virtual environment virtualenv wg-venv -p python3

• Activate the virtual environment source wg-venv/bin/activate

• Install requirements pip install -r requirements_devel.tx

• Run the application python manage.py runserver

• Log in to the application.

• Navigate to the nutrition plan section.

• Add at least 25 nutrition plans.

• Open developer tools and note the time difference between Normal reload and hard reload.

Any background context you want to provide?

• Before this implementation, loading nutritional plans took a longer time than it takes currently.

What are the relevant pivotal tracker stories?

#159236196

Screenshots (if appropriate)

Before

After

[coveralls]

Pull Request Test Coverage Report for Build 285

• 69 of 69 (100.0%) changed or added relevant lines in 6 files are covered.
• 35 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.2%) to 92.897%

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Files with Coverage Reduction	New Missed Lines	%
wger/exercises/tests/test_categories.py	1	100.0%
wger/manager/views/set.py	1	96.33%
wger/manager/forms.py	2	100.0%
wger/exercises/tests/test_muscles.py	3	100.0%
wger/exercises/tests/test_equipment.py	3	100.0%
wger/exercises/tests/test_exercise.py	6	100.0%
wger/utils/widgets.py	19	97.4%

Totals
Change from base Build 277:	-0.2%
Covered Lines:	12163
Relevant Lines:	13093

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💛 - Coveralls

[RrNn]

LGTM

[solnsubuga]

LGTM

[ja-odur]

LGTM