heap_caps_dump() function

Dump the full structure of all heaps with matching capabilities. Prints a large amount of output to serial (because of locking limitations, the output bypasses stdout/stderr). For each (variable sized) block in each matching heap, the following output is printed on a single line: - Block address (the data buffer returned by malloc is 4 bytes after this if heap debugging is set to Basic, or 8 bytes otherwise). - Data size (the data size may be larger than the size requested by malloc, either due to heap fragmentation or because of heap debugging level). - Address of next block in the heap. - If the block is free, the address of the next free block is also printed.