add set_if_changed(Attributes) and hydrate(trait Apply) methods#4158

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tikitko:img-src-re-downloaded-on-hydration-because-all-attributes-are-unconditionally-re-appliedtikitko/yew:img-src-re-downloaded-on-hydration-because-all-attributes-are-unconditionally-re-appliedCopy head branch name to clipboard