* add clear_blocks interface for flatbuffers view, test=develop

* fix a bug, test=develop

* enhanced the error messages, test=develop

* [cherry-pick] not build naive_buffer when build light framework, test=develop (#4251)

* fix opt fatal errors, test=develop (#4293)

* fix cmake dependencies, test=develop

* fix save interfaces of flatbuffers, test=develop

* fix the header file, test=develop

* input_vars of flatbuffers impl, test=develop

* add comments in build.sh, test=develop

* add build macros for flatbuffers, test=develop

* speed up vector assignment, test=develop

* update op_desc with c-string, test=develop

* update compatible_pb.cc, test=develop

* using unique_ptr in fbs::desc, test=develop

* add fbs to compatible_pb, test=develop

* update model_parser functions, test=develop

* fix bugs, test=develop

* add view suffix to read-only classes for flatbuffers, test=develop

* add some write-apis for flatbuffers, test=develop

* [test] flatbuffers io, test=develop

* determine the basic interfaces and help functions of flatbuffers, test=develop

* add ParamDesc, test=develop

* serialize tensor funcs, test=develop

* [Core][ARM] Fix beam_search, eltwise_mul supports broadcast and int64_t data type, add print op and kernel, add exeception
test=develop

* Fix the dims of parent idx of the arm kernel of beam_search op

* elementwise_mul supports int64_t data type with broadcasting

* Add print op and kernel for debugging

* Support throwing the exception when the internal error occurs

* Refine while and conditional_block op kernel

* Support the graph optimization on subblocks

* Pass program_desc and block_idx into the kernel of the control flow ops(while/conditional_block/subgraph), and create the RuntimeProgram online, it make it possiable to call the control flow ops recursively

*Add unit test for masked transformer model

* read-only modification of cppDesc, test=develop

* update io.cc, test=develop

* fix the code style, test=develop

* update desc interfaces, test=develop

* update desc interfaces, test=develop

* update compatible_pb.cc, test=develop

* fix build errors, test=develop

* remove the fstream to shrink the size of library, test=develop

* align opdesc interfaces, test=develop

* align opdesc interfaces, test=develop

* split the vector_view, test=develop

* update OpDataTypeTrait, test=develop

* update traits.h, test=develop

* update fbs op_desc, test=develop

* remove header files, test=develop

* add comments, test=develop

* fix dependencies, test=develop

* vector view for flatbuffers, test=develop

* update dependencies, test=develop

* add flatbuffers, test=develop

* fix cmake codes, test=develop

* [LITE][PASS] Add pass for removing uesless reshape2 / squeeze2. test=develop

* reduce .so size. test=develop

* compile all targets when LITE_ON_TINY_PUBLISH=OFF

* unordered_map is more convenient when key is customized class

* test=develop

* test=develop,test=coverage, support coverage CI on x86 server

* test=develop,test=coverage, fix the conflict

* test=develop,test=coverage, add target code_coverage

* test=develop,test=coverage, modify the coveralls.cmake

refactor(*): reduce Wsign-compare warning