build: adding link time optimization support

[SuperFola]

Adding LTO support

Description

Adding IPO/LTO support when building, if the compiler can provide it.

Checklist

• I have read the Contributor guide
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation if needed
• I have added tests that prove my fix/feature is working
• New and existing tests pass locally with my changes

[SuperFola]

I was able to reproduce the segfault of the gcc 8 build by downloading the artifact. Here is the gdb logs

gdb --args ./arkscript ~/code/Ark/tests/arkscript/unittests.ark --lib ./lib
(gdb) r
Starting program: /home/fola/code/ark-debug/ubuntu-gcc8/arkscript /home/fola/code/Ark/tests/arkscript/unittests.ark --lib ./lib
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00005555555bc338 in std::filesystem::__cxx11::path::_M_split_cmpts() ()
(gdb) bt
#0  0x00005555555bc338 in std::filesystem::__cxx11::path::_M_split_cmpts() ()
#1  0x00007ffff7f21a7d in std::filesystem::current_path[abi:cxx11](std::error_code&) () from /lib/x86_64-linux-gnu/libstdc++.so.6
#2  0x00007ffff7f21e1a in std::filesystem::current_path[abi:cxx11]() () from /lib/x86_64-linux-gnu/libstdc++.so.6
#3  0x00007ffff7bafa84 in Ark::Utils::canonicalRelPath(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () from libArkReactor.so
#4  0x00007ffff7bb0048 in Ark::internal::Parser::feed(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ()
   from libArkReactor.so
#5  0x00007ffff7ba3c81 in Ark::Compiler::feed(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ()
   from libArkReactor.so
#6  0x00007ffff7b9d6d6 in Ark::State::compile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ()
   from libArkReactor.so
#7  0x00007ffff7b9dba3 in Ark::State::doFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () from libArkReactor.so
#8  0x000055555556bf85 in main ()

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Seems related to https://stackoverflow.com/questions/63902528/program-crashes-when-filesystempath-is-destroyed

[SuperFola]

The solution was to disable LTO on GCC 8.