feat: add docling cli (#75)

* chore: add simple convert script

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* reformatted all

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* reformatted all

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* added default arg

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* use typer for the docling CLI

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* describe output when saving

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* add tests for CLI

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* add export options

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

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Signed-off-by: Peter Staar <taa@zurich.ibm.com>
Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>
Co-authored-by: Michele Dolfi <dol@zurich.ibm.com>