[IMP] delivery, mrp, stock: group delivery slips by kit

This commit extends the delivery slip so that products added as a kit
component to a stock.picking are grouped together by kit (or non-kit)
when at least 1 kit exists. Kit grouping occurs for products from a kit
without a package assigned. Non-kit section appears only when no
packages are assigned.

Implementation notes:
- Sub-kits (i.e. kits within kits) of kits are purposely not included
- Duplicate product names with different BOMs will be merged into one
  since there is no straightforward way to distinguish them within
  current db structure
- There are some cases where this doesn't work as expected and may lead
  to components being grouped together under the same kit even if they
  are from different kits (e.g. kit1 has bolts and so does kit2 => on
  slip bolts will only show under kit1 section). Two cases where this
  happens is when kits are added before 'Operation Type' is specified
  and 'Operation Type = Manufacturing'

This completes subsection 1 of overall Improve delivery slip task.

Task: 2039720

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