[4.x] add back button to header

[alissn]

hello,

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In this pull request, a back button has been added to the header. Additionally, a configuration option has been introduced to modify the redirect URL:

back_button_url: This setting defines the redirect URL for the back button. If this value is set to null, the button will be hidden.
back_button_label: This setting determines the title of the button.

Here's a screenshot for reference:

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If possible, please consider releasing your code as a package so that the community can still take advantage of your contributions!

If you feel absolutely certain that this code corrects a bug in the framework, please "@" mention me in a follow-up comment with further explanation so that GitHub will send me a notification of your response.