feat: adds viewer context to casts, idem to cast and reactions, parent_author_fid to cast post

[MrKevinOConnell]

Updated methods: publishCast -> https://docs.neynar.com/reference/post-cast

• idem and parent_author_fid optional parameters added publishReactionToCast -> https://docs.neynar.com/reference/post-reaction
• idem optional parameter added

misc:

• viewer_context added as a optional type toCastWithInteractions

version update is in #112