[uTVM][Runtime] Introduce Virtual Memory Allocator to CRT (#5124)

[uTVM][Runtime] Introduce Virtual Memory Allocator to CRT (#5124)

* initial crt_memory and memory leak fix in graph_runtime

Change-Id: I0f79f909a04d1c677aabb80f202f0612c5ce7f2a

* fix memory leak

Change-Id: I37104c09e28112b1974fa2b064c809d0a8d686c3

* clean up

Change-Id: I039b12015a1d56c8f4120867cd5a5292da34f3e3

* implement vrealloc

Change-Id: I35800470bcbfcf96652494f359711cb4c2d34398

* allocate from stack memory for most of the variables

Change-Id: I72071289843fff4031c0df8796868a0b9fbc57ee

* allocate from stack memory for all of the variables

Change-Id: I32dba85ac1660c77f51c2d0d8ab6436ed0c01c74

* lint

Change-Id: If12cd240685d7791fc60bc0cfb66389cdc186b73

* lint

Change-Id: I7c9d90c11b60b8edda2427ebd189ebe535af2100

* facilitate the growth of TVM_CRT_MAX_NDIM

Change-Id: I939fa43027a5c7529c5c7c6bd8d6e6beb91b7581

* extend test coverage of vmalloc

Change-Id: Ie4ff6b64fdfe6810836cf8fd44dace82a20c4581

* lint

Change-Id: Ibf3c06619ef296df5c49f3945cb6428777781d69

* move logging.h to src

* fix an error in macOS

* remove logging.h

* use cflags for gcc

* fix compilation error