build: enable stack frame size diagnostics

It has been observed that certain call-chains are too large for a 4 KiB
kernel stack. While we have increased the stack on x86-64 to 8 KiB, it
seems desirable to enable diagnostics that warn us of large stack
frames.

This changeset introduces 3 new CMake configuration options, two of
which are considered internal:

TEACHOS_STACK_FRAME_LIMIT:

  The size limit of in bytes we are willing to accepts for any given
  stack frame. Defaults to "0", meaning the internal defaults are used
  per build configuration.

TEACHOS_STACK_FRAME_LIMIT_DEBUG:
TEACHOS_STACK_FRAME_LIMIT_RELEASE:

  !!internal!!

  The default stack frame size limit in bytes, per configuration, if no
  user specified stack frame size limit was defined at configure time.

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