[Lua, Fishing, Quest] Added quest 'The Real Gift'

[Flibe-XI]

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• [x] I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• [x] I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• [x] I have read and understood the Contributing Guide and the Code of Conduct.
• [x] I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Converts quest "The Gift" to IF format.

Steps to test these changes

!completequest 4 17 -- under the sea !completequest 4 21 -- the gift Talk to Oswald !additem 4484 -- shall shell Trade shall shell to Oswald Talk to him again for replacement default text