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Drop Grape::Middleware::Globals

Grape::Middleware::Globals and its three env keys
(Grape::Env::GRAPE_REQUEST, GRAPE_REQUEST_HEADERS, GRAPE_REQUEST_PARAMS)
have been dead code for years. The middleware was introduced in 2013
(commit 9987090b, bundled awkwardly into an oauth2 change) and was never
mounted by Grape's own stack — Endpoint builds its Grape::Request
directly. Nothing in lib/ reads grape.request* either; the env keys had
no internal consumers.

Outside lib/ the only reference was the file's own spec. README and
UPGRADING never mentioned the class.

Removing the class, the spec, and the three constants. Original
implementation preserved in history: see commit 6b4111b3 (master before
this change) for the file content.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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