Use csolution rpc (server mode) for VS Code Build process

[ReinhardKeil]

The Problem To Be Solved
The benefit of the csolution rpc mode is the reduction in overhead caused by repeating unnecessary steps my moving the orchestration to VSCode. Status and messages do not need to be written to files, monitored and read for processing.
The extension ships the latest, well tested and feature aligned CMSIS-Toolbox which is consistently used with the extension and versions do not get mixed.

Suggest A Solution
The final missing step is to invoke the binary build steps from the CMSIS Solution Extension. Assuming that all steps from cbuild setup have completed including cmake invocation for compile_commands.json file generation, only the cmake build step needs to be invoked.