Add encoding_read_in_multibyte_sequence API.
Detail: The new API allows the client to determine if a read codec has run out of input in the middle of a multibyte sequence. This permits a client to distinguish between the two cases in which no output character is generated: a) insufficient input has been provided to complete an output character b) the input consisted of a complete multibyte sequence which generates no output (e.g. an ISO-2022 shift sequence) Admin: Tested using Iconv. Version 0.60. Tagged as 'Unicode-0_60'
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