8371759: Add missing @Override annotations in com.sun.imageio package

[mrserb]

This patch adds missing @Override annotations to methods in the com.sun.imageio package that override methods from a superclass or interface.
Only source annotations are added; there are no behavioral changes.

The previous patch for com.sun.beans can be found here: #27887.

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Issue

• JDK-8371759: Add missing @Override annotations in com.sun.imageio package (Bug - P5)

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