[IMP]stock,product_expiry: improve error message for sn number check

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PURPOSE
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Improve duplicated serial number message to show more information.

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SPEC
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In this commit, we show full information about all invalide product name
and lot/sn number when the user enters duplicated ones.

- Change the sql constraint for checking duplicate sn/lot to python
constraint to support customised error message.
- Create lot in batch to show all invalide ones in error message.

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LINKS
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task 2083605
pr #44366

Related: odoo/upgrade#954
Signed-off-by: Simon Lejeune (sle) <sle@openerp.com>