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Generic-ELF: Add platform module to configure the .elf file extension
The `.elf` extension is a common convention used for embedded binaries. Both Arm and RISC-V use the ELF file format for executables. Configuring the `.elf` file extension is typically done incorrectly. Most embedded developers set this in toolchain files, which is not the correct place. This is typically accomplished through a hack by setting the individual language file extensions for C, CXX, and ASM. Multiple CMake issues in the past have been opened related to this. * #16538 * #20163 * #17880 A platform module makes it simpler and less error prone for developers targeting these ubiquitous bare-metal platforms. This PR attempts to solve this globally with a generic platform. This could also be solved by using more specific platform modules, such as one for each of bare-metal Arm and RISC-V.