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Define ncbmbuf which is an alternative non-contiguous buffer implementation. "bm" abbreviation stands for bitmap, which reflects how gaps and filled blocks are encoded. The main purpose of this implementation is to get rid of the ncbuf limitation regarding the minimal size for gaps between two blocks of data. This commit adds the new module ncbmbuf. Along with it, some utility functions such as ncbmb_make(), ncbmb_init() and ncbmb_is_empty() are defined. Public API of ncbmbuf will be extended in the following patches. This patch is not considered a bug fix. However, it will be required to fix issue encountered on QUIC CRYPTO frames parsing. Thus, it will be necessary to backport the current patch prior to the fix to come.