Allow the page title customization from the ModelView

[mrharpo]

Page title

Adds title customization.

Usage

Overwrite the title function in your view:

class MyView(BaseView):
    def title(self, request: Request):
        return 'Custom Title'

You can also set a title per request type:

    def title(self, request: Request) -> str:
        if request.state.action == RequestAction.LIST:
            return self.label
        if request.state.action == RequestAction.DETAIL:
            return f'{self.label} - {request.path_params["pk"]}'
        if request.state.action == RequestAction.EDIT:
            return f'{self.label} - Edit {request.path_params["pk"]}'
        if request.state.action == RequestAction.CREATE:
            return f'{self.label} - Create'
        return None

Closes #310

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (9a5a604) 100.00% compared to head (72b8124) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #311   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           68        68           
  Lines         5003      5009    +6     
=========================================
+ Hits          5003      5009    +6     

Files	Coverage Δ
starlette_admin/base.py	100.00% <100.00%> (ø)
starlette_admin/views.py	100.00% <100.00%> (ø)

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[jowilf]

Thank you for your contribution🎉.