feat: Assignment and course grade fields validations (palm.master)

[vladislavkeblysh]

• Added min max validations to assignments grade fields
• Added validations when min value must be less than max value

[openedx-webhooks]

Thanks for the pull request, @vladislavkeblysh!

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[mphilbrick211]

Hi @arbrandes! Are you able to take a look at this for us?

[farhaanbukhsh]

@mphilbrick211 I am reviewing the PR against the master once that is done this PR can easily be tweaked/merged. :)

[farhaanbukhsh]

Based on #366