Add EBcLfSA as Platform

[opajonk]

Added "EB corbos Linux for Safety Applications" (EBcLfSA) as Runtime Ecosystem, added the currently used GCC version, and created a platform definition.

[opajonk]

I added the settings to the best of my knowledge. However, I am unsure about the following:

• While I used "GCC 13.3.0" as constraint, this cannot be any GCC toolchain - EBcLfSA requires a specific toolchain, which includes a certain tool that is used to mark high integrity applications (i.e. "safety applications", colloquially speaking).
• Eventually, we will need to transition to a clang-based compiler, and a certain libc, for this platform. Is this going to be a problem if I define the platform now via the GCC version? Should we rather use "ebclfsa_0.5" or something similar instead of "gcc_13.3.0" to mark this as "special toolchain required, and this toolchain is not yet at 1.0 level since we will need to actually switch the compiler"?

[opajonk]

OK I think I answered the questions more or less myself by trying to add a toolchain to "bazel_cpp_toolchains" :-)

[nradakovic]

New constraint is added under SDK version. Once this is merged you can define your platform in following order:
cpu-os-sdk_version-runtime_os --> aarch64-linux-sdk_0.1.0-ebclfsa