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gdb: explore stack of non-current fiber

This commit introduce commands:
- info tt-fibers (Display fibers of the current cord)
- tt-fiber FID (Select fiber which stack need to be explored)

After selecting the desired fiber its stack can be explored with
general stack commands of GDB (bt, frame, etc.)

Closes #7733

NO_DOC=gdb extension
NO_CHANGELOG=gdb extension
NO_TEST=gdb extension

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