feat: added modal to save most used snippets and pre-fill the code editor

[OmerBhatti]

Issue

Closes: Allow users to save most used snippets

Changes

• Added a modal to save code snippets
• Added a dropdown to select saved snippets
• Double click any code snippet to save it to db

Screenshots

[djk2]

[djk2]

Please look on CI/CD actions, there is a error: django.urls.exceptions.NoReverseMatch: Reverse for 'admin_shell_savedsnippet_add' not found. 'admin_shell_savedsnippet_add' is not a valid view function or pattern name.

Problem is related to this part of template:

{% url 'admin:admin_shell_savedsnippet_add' %}

Unfortunately it not working in Django <= 3.1

This is corrent for 4.2 {% url 'admin:admin_shell_savedsnippet_add' %}

This form is proper for older versions: {% url 'admin:django_admin_shell_savedsnippet_add' %}

I suggest to calculate URL on view level, for example in method

def get_saved_snipets_admin_url(self):
      if django.VERSION < (4, 0):
           reutrn reverse('....)
      else: 
          return reverse('....)

and pass url in context

To check compatible of your code, you can launch tox command locally to tests application code for all supported versions django and python