Implement eglCreateImage and eglDestroyImage

Refactor existing KHR functions so that they become common code
that both the KHR and core functions call.

Test: cts-tradefed run commandAndExit cts -m CtsDeqpTestCases --module-arg 'CtsDeqpTestCases:include-filter:dEQP-EGL.*'
Bug: 80297325

Change-Id: I6cdac9adc7b2d0b9f2adef91db099a0e6dc92e57
(cherry picked from commit 63c29fe127c2bbf5f598a24b38e667539dda0449)
(cherry picked from commit fda88bed5923f146eb428a2dffdb44993d6f43d7)