[FIX] account: communication size

- Create 5 vendor bills with a long reference (> 1000 characters), for
the same partner.
- Select the bills and register a payment

An error arise: 'psycopg2.OperationalError: index row size 3256 exceeds
maximum 2712 for index "account_move_line_partner_id_ref_idx"'.

As mentioned, the index row size limit is 2712 bytes, which is exceeded
in that use case. Indeed, the reference of the payment is computed based
on the vendor reference of all bills.

We limit the number of characters to 2000. This seems reasonable knowing
that UTF-8 characters use sequences of 1 to 4 bytes [1]. Characters with
a code less than 128 require 1 byte only, and it is expected that most
vendor references will only use these characters. It is indeed unlikely
that special characters (such as Chinese characters, taking up to 4
bytes) are used for such references.

[1] https://tools.ietf.org/html/rfc3629

opw-1998823

closes odoo/odoo#33457

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

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