µTVM CRT modifications for on-device RPC server (#5921)

µTVM CRT modifications for on-device RPC server (#5921)

* Reorganize CRT into parts, public API, and add standalone build.

 * Create a make-based build in src/runtime/crt. This is intended to
   be built in build/standalone_crt (generated by running ninja
   standalone_crt in build/). Its job is to build CRT without
   depending on headers not explicitly allowed in CRT.
 * Create a "public-facing" CRT API targeted to firmware running
   alongside CRT in include/tvm/runtime/crt. Developers who are
   integrating the CRT are the target of this API.
 * Reorganize CRT internally into common/ and graph_runtime/
   pieces. Build each pieces as a separate statically-linked library.
 * Slim down TVMGraphRuntime public-facing API to just the functions
   that are used externally.
 * Updates to apps/bundle_deploy to make this work.

* Add TVMFuncRegistry, CRT test infrastructure, and tests.

 * Also add error_codes.h, a file containing error codes returned by CRT.

* Add TVMErrorf()

* [API_CHANGE] Integrate func registry into CRT.

 * NOTE: This changes the default API for functions exposed under the
   CRT by the TVMFuncCall API. `resource_handle` is now always given
   as a new 6th parameter.
 * `resource_handle` is NULL when invoked on a global function and a
   pointer to the module owning the function otherwise.

* Generalize arena-based memory manager.

* lint

* Fix git-clang-format arg parsing

* add apache header

* add mutable func registry tests

* git-clang-format

* fix more lint

* Move memory_test to crttests.

* fix tests

* checkpoint

* checkpoint

* bundle_deploy demo_static works

* rm debug printf

* git-clang-format

* fix lint

* add asf header

* pylint

* update build configs for jenkins

* make regression compiler happy

* fix build errors in regression GCC

* address comments

* git-clang-format

* fix for 32-bit cpp regression

* fix incorrect use of memcpy and tests for 32-bit

* clang-format