[ADD] l10n_pl: add Polish states to localization

Courtesy of karol185 - based on #37429
Since Poland does not require states
(https://www.bitboost.com/ref/international-address-formats/poland/

)
Add them in the l10n_pl module and not with the other states in the
base module

closes odoo/odoo#42273

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

addons/l10n_pl/__manifest__.py

@@ -28,6 +28,7 @@ Wewnętrzny numer wersji OpenGLOBE 1.02
     'data': [
               'data/l10n_pl_chart_data.xml',
               'data/account.account.template.csv',
+              'data/res.country.state.csv',
               'data/l10n_pl_chart_post_data.xml',
               'data/account_data.xml',
               'data/account_tax_report_data.xml',

addons/l10n_pl/data/res.country.state.csv

+"id","country_id:id","name","code"
+state_pl_ds,pl,"dolnośląskie","DŚ"
+state_pl_kp,pl,"kujawsko-pomorskie","KP"
+state_pl_lb,pl,"lubelskie","LB"
+state_pl_ls,pl,"lubuskie","LS"
+state_pl_ld,pl,"łódzkie","ŁD"
+state_pl_mp,pl,"małopolskie","MP"
+state_pl_mz,pl,"mazowieckie","MZ"
+state_pl_op,pl,"opolskie","OP"
+state_pl_pk,pl,"podkarpackie","PK"
+state_pl_pl,pl,"podlaskie","PL"
+state_pl_pm,pl,"pomorskie","PM"
+state_pl_sl,pl,"śląskie","ŚL"
+state_pl_sk,pl,"świętokrzyskie","ŚK"
+state_pl_wm,pl,"warmińsko-mazurskie","WM"
+state_pl_wp,pl,"wielkopolskie","WP"
+state_pl_zp,pl,"zachodniopomorskie","ZP"