Add APIs for length_prefixed parsing and serializing. #19177
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Only implemented on upb for first pass, will implement for cpp kernel in a followup Note that this is the 'simplest' API to make it possible to do length-prefixed parse/serialize; as it requires the entire input to be in memory before the parsing starts it may not be ideal for some streaming parsing usecases, which is something we can improve based on demand at a later date. PiperOrigin-RevId: 694112905
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Add APIs for length_prefixed parsing and serializing.
Only implemented on upb for first pass, will implement for cpp kernel in a followup
Note that this is the 'simplest' API to make it possible to do length-prefixed parse/serialize; as it requires the entire input to be in memory before the parsing starts it may not be ideal for some streaming parsing usecases, which is something we can improve based on demand at a later date.