Support StackFrameFormat

[JDevlieghere]

The debug adapter protocol supports an option to provide formatting information for a stack frames as part of the StackTrace request. We should support this in lldb-dap.

https://microsoft.github.io/debug-adapter-protocol/specification#Types_StackFrameFormat
https://github.com/microsoft/VSDebugAdapterHost/wiki/Stack-Trace-and-Value-Formatting

[llvmbot]

@llvm/issue-subscribers-lldb-dap

Author: Jonas Devlieghere (JDevlieghere)

The debug adapter protocol supports an option to provide formatting information for a stack frames as part of the StackTrace request. We should support this in lldb-dap.

https://microsoft.github.io/debug-adapter-protocol/specification#Types_StackFrameFormat
https://github.com/microsoft/VSDebugAdapterHost/wiki/Stack-Trace-and-Value-Formatting

[JDevlieghere]

lldb-dap reports that it supports value and stack formatting (supportsValueFormattingOptions) but looking at the code, we support neither.