Add Pronatura Bydgoszcz (#2138)

* Add Pronatura Bydgoszcz

* follow contribution guide, clean code, address PR comments

* rename + minor changes

pronatura_bydgoszcz rename to match URL (add _pl)
removed unnecessary method get_data
NAME_MAP[waste_type] and ICON_MAP[waste_type] with get equivalents to prevent failour on name change
modified md file to be more in line with other sources

---------

Co-authored-by: 5ila5 <5ila5@users.noreply.github.com>

doc/source/pronatura_bydgoszcz_pl.md

@@ -0,0 +1,35 @@
+# Pronatura Bydgoszcz
+
+Support for schedules provided by [Pronatura Bydgoszcz](http://www.pronatura.bydgoszcz.pl/), serving Bydgoszcz, Poland.
+
+There are other companies providing garbage collection services in Bydgoszcz (Remondis and Corimp) but this source does not support them.
+
+To check which provider you have, visit this page at [Czysta Bydgoszcz](https://www.czystabydgoszcz.pl/odpady-komunalne/podzial-na-sektory/).
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: pronatura_bydgoszcz_pl
+      args:
+        street_name: STREET_NAME
+        street_number: STREET_NUMBER
+```
+
+**street_name**  
+*(string) (required)*
+
+**street_number**  
+*(string|integer) (required)*
+
+## Example
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: pronatura_bydgoszcz_pl
+      args:
+        street_name: JÓZEFA SOWIŃSKIEGO
+        street_number: 22A
+```