Added public initializers to Lexicons: UploadBlobOutput, BlobReference, ReplyReference

[mcprostar205]

Description

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Linked Issues

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Type of Change

• [X ] Bug Fix
• New Feature
• Documentation

Checklist:

• [X ] My code follows the ATProtoKit API Design Guidelines as well as the Swift API Design Guidelines.
• I have performed a self-review of my own code and commented it, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings or errors in the compiler or runtime.
• My code is able to build and run on my machine.

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[MasterJ93]

Thanks for the PR! I'll go ahead and merge it. It'll be available in the next update (after the weekend: I'm going to add a couple more things in the next update).