tfdbg CLI: add text summary of numeric values
tfdbg CLI: add text summary of numeric values

For the `pt` or `print_tensor` command, the numeric summary can be activated with the `-s` option flag, e.g.,

tfdbg> pt -s cross_entropy/Log:0

Numeric summaries are applicable only to non-empty tensors of Boolean and numeric (int*, float*, complex*) types.

PiperOrigin-RevId: 161350396

tensorflow/docs,tensorflow/docs,tensorflow/docs-l10n,tensorflow/docs