feat: Additional DoclingDocument methods for use in MCP document manipulation (#344)

* insert_* methods and range manipulation methods

* DCO Remediation Commit for Ryan Fernandes <[email protected]>

I, Ryan Fernandes <[email protected]>, hereby add my Signed-off-by to this commit: cc0c4b2

Signed-off-by: Ryan Fernandes <[email protected]>

* insert_node_items method with recursive _append_item_copies helper for cross-document manipulation

Signed-off-by: Ryan Fernandes <[email protected]>

* add_node_items complement to inser_node_items, refactored extract_items_range to be more robust, added insert/add_document

Signed-off-by: Ryan Fernandes <[email protected]>

* Extended table data editing functionality

Signed-off-by: Ryan Fernandes <[email protected]>

* Added new document manipulation tests

* Extra gt files

* Refactor for reusable code - table methods

* Private methods for more concise insert_* methods

Signed-off-by: Ryan Fernandes <[email protected]>

* Docstring changes

Signed-off-by: Ryan Fernandes <[email protected]>

* ValueError for failed insertions

Signed-off-by: Ryan Fernandes <[email protected]>

* DCO Remediation Commit for Ryan Fernandes <[email protected]>

I, Ryan Fernandes <[email protected]>, hereby add my Signed-off-by to this commit: 01e8b9c
I, Ryan Fernandes <[email protected]>, hereby add my Signed-off-by to this commit: 8c016d9
I, Ryan Fernandes <[email protected]>, hereby add my Signed-off-by to this commit: 3089002

Signed-off-by: Ryan Fernandes <[email protected]>

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Signed-off-by: Ryan Fernandes <[email protected]>

Author: Ryfernandes