[2022-08-17] Split glossary into 3 files and add to rfcs folder

[benjie]

split existing document up into 3 parts:

• Glossary.md (generic terms)
• VendorSolutions.md (the solutions that are out there)
• TermsToAvoid.md (branded/misleading/ambiguous terms)

• assignee(s): @n1ru4l
• source: https://github.com/graphql/composite-schemas-wg/blob/main/notes/2022/2022-08-17.md#next-steps-for-subschema-composability-rules-15m-uri:~:text=To%20split%20existing,misleading/ambiguous%20terms)

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Note: Action Item issues are reviewed and closed during Working Group
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[benjie]

@n1ru4l Please reply so I can assign you

[obi1kenobi]

Adding a note before we all forget: let's make sure to add client and server to the TermsToAvoid.md file, since they are loaded terms that can prevent us from exploring parts of the solution space.