[runtime/utils/buffer] fix out of range bug due to shortened read buffer #1354
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Do not leave the buffer in a state where self.buffer().len < self.buffer_size, which can lead to panics if the reader is rewinded. (Addresses out of range for slice in runtime/src/utils/buffer/read.rs:136 #1348)
Regression test for above issue.
Document panic condition in read_exact.