devtool: new ide-sdk plugin

devtool: new ide-sdk plugin

The new devtool ide plugin provides the eSDK and configures an IDE to
work with the eSDK. In doing so, bitbake should be used to generate the
IDE configuration and update the SDK, but it should no longer play a
role when working on the source code. The work on the source code should
take place exclusively with the IDE, which, for example, calls cmake
directly to compile the code and execute the unit tests from the IDE.

The plugin works for recipes inheriting the cmake or the meson bbclass.
Support for more programming languages and build tools may be added in
the future.

There are various IDEs that can be used for the development of embedded
Linux applications. Therefore, devtool ide-sdk, like devtool itself,
supports plugins to support IDEs.
VSCode is the default IDE for this first implementation. Additionally,
some generic helper scripts can be generated with --ide none instead of
a specific IDE configuration. This can be used for any IDE that
supports calling some scripts.

There are two different modes supported:

- devtool modify mode (default):
  devtool ide-sdk configures the IDE to manage the build-tool used by the
  recipe (e.g. cmake or meson). The workflow looks like:
    $ devtool modify a-recipe
    $ devtool ide-sdk a-recipe a-image
    $ code "$BUILDDIR/workspace/sources/a-recipe"
    Work in VSCode, after installing the proposed plugins

  Deploying the artifacts to the target device and running a remote
  debugging session is supported as well.
  This first implementation still calls bitbake and devtool to copy the
  binary artifacts to the target device. In contrast to compiling,
  installation and copying must be performed with the file rights of the
  target device. The pseudo tool must be used for this. Therefore
  bitbake -c install a-recipe && devtool deploy-target a-recipe
  are called by the IDE for the deployment. This might be improved later
  on.

  Executing the unit tests out of the IDE is supported via Qemu user if
  the build tool supports that. CMake (if cmake-qemu.bbclass is
  inherited) and Meson support Qemu usermode.

- Shared sysroots mode: bootstraps the eSDK with shared sysroots for
  all the recipes passed to devtool ide-sdk. This is basically a wrapper
  for bitbake meta-ide-support && bitbake build-sysroots. The workflow
  looks like:
    $ devtool ide-sdk --share-sysroots a-recipe another-recipe
    vscode where/the/sources/are
  If the IDE and the build tool support it, the IDE gets configured to
  offer the cross tool-chain provided by the eSDK. In case of VSCode and
  cmake a cmake-kit is generated. This offers to use the cross
  tool-chain from the UI of the IDE.

Many thanks to Enguerrand de Ribaucourt for testing and bug fixing.

Signed-off-by: Adrian Freihofer <adrian.freihofer@siemens.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>