This allows other debugger extensions to leverage the `lldb-dap`
extension's settings and logic (e.g. "Server Mode").
Other debugger extensions can invoke these commands to resolve
configuration, create adapter descriptor, and get the `lldb-dap` process
for state tracking, additional interaction, and telemetry.
VS Code commands added:
* `lldb-dap.resolveDebugConfiguration`
* `lldb-dap.resolveDebugConfigurationWithSubstitutedVariables`
* `lldb-dap.createDebugAdapterDescriptor`
* `lldb-dap.getServerProcess`
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