[Fuzzer] Add fuzzer support for linux (#21996)
### Description
Added some change in fuzzer project code to support linux also.
How to test on linux:
1. Make sure you have installed clang/llvm.
2. run below command to build asan instrumented project:
```
CFLAGS="-g -fsanitize=address -shared-libasan -fprofile-instr-generate -fcoverage-mapping" CXXFLAGS="-g -shared-libasan -fsanitize=address -fprofile-instr-generate -fcoverage-mapping" CC=clang CXX=clang++ ./build.sh --update --build --config Debug --compile_no_warning_as_error --build_shared_lib --skip_submodule_sync --skip_tests --use_full_protobuf --parallel --fuzz_testing --build_dir build/
```
3. run fuzzer for some time, it will generate *.profraw file:
```
LLVM_PROFILE_FILE="%p.profraw" ./build/Debug/onnxruntime_security_fuzz /t /v onnxruntime/test/testdata/bart_tiny.onnx 1 m
```
4. Get the cov by running below cmd:
```
llvm-profdata merge -sparse *.profraw -o default.profdata
llvm-cov report ./build/Debug/onnxruntime_security_fuzz -instr-profile=default.profdata
```
<img width="1566" alt="Screenshot 2024-09-05 at 4 25 08 PM"
src="https://github.com/user-attachments/assets/2aa0bb83-6634-4d33-b026-3535e97df431">
### Motivation and Context
1. Currently fuzzer only supports windows and MSVC, we can't generate
the code coverage using MSVC. With clang/llvm we can try and use clang
instrumentation and llvm tools like llvm-cov.
2. In future we can add coverage guided fuzzer (libfuzzer) in same
project. (Working on it)
