Add East Devon District Council (#1827)

* Add East Devon District Council

* numeric test case + minor refactoring

---------

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

doc/source/eastdevon_gov_uk.md

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+# East Devon District Council
+
+Support for schedules provided by [East Devon District Council](https://eastdevon.gov.uk/), serving East Devon, UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: eastdevon_gov_uk
+      args:
+        uprn: UNIQUE_PROPERTY_REFERENCE_NUMBER
+```
+
+### Configuration Variables
+
+**uprn**
+*(string) (required)*
+
+
+## Examples
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: eastdevon_gov_uk
+      args:
+        uprn: "010000246114"
+```
+
+## How to find your UPRN
+
+An easy way to discover your Unique Property Reference Number (UPRN) is by looking at the url of you collection schedule on the East Devon District Council website. The set of numbers at the end of the url are your uprn.
+
+For example: 
+eastdevon.gov.uk/recycling-and-waste/recycling-and-waste-information/when-is-my-bin-collected/?UPRN=`010000246114`_
+
+Alternatively, you can go to  to [Find My Address](https://www.findmyaddress.co.uk/) and search for
+your address.