Docs: Add python testing documentation (project-chip#31996)

* check

* Docs: Add python documentation

Taken from the tutorial session presented at the Geneva member
meeting, available here:
https://groups.csa-iot.org/wg/matter-csg/document/32281

* fix a couple of todos

* Fix spelling in API documentation

* Fix reference

* remove braces

* Restyled by prettier-markdown

* Restyled by shellharden

* Exclude python docs from spelling

These are both covered by the other spell checker and include so
many camel cased words that it's going to pollute the spelling
list excessively.

* Fix spelling, add words to wordlist

* more spelling

* Restyled by prettier-markdown

---------

Co-authored-by: Restyled.io <commits@restyled.io>

Author: cecille

.github/.wordlist.txt

@@ -465,6 +465,7 @@ EchoMessage
 EchoRequests
 EchoResponse
 EchoService
+ECW
 edaf
 edc
 EDR
@@ -738,6 +739,7 @@ kCase
 Kconfig
 kDacPublicKey
 KeypadInput
+keypair
 keyset
 kGroup
 kInvalidCommandId
@@ -884,6 +886,7 @@ mlan
 MLD
 mmevk
 moal
+Mobly
 ModeSelect
 modprobe
 Modustoolbox
@@ -948,6 +951,7 @@ nrfdks
 nrfutil
 nrfxlib
 NTAG
+NTP
 nullable
 nullptr
 NUM
@@ -1013,6 +1017,7 @@ OTBR
 otcli
 outform
 outgoingCommands
+overridable
 OxygenConcentrationMeasurement
 OzoneConcentrationMeasurement
 PAA
@@ -1051,6 +1056,7 @@ perfetto
 periodicQueryTimeout
 pexpect
 pickString
+PICSCODE
 PID
 Pigweed
 PinCode
@@ -1366,6 +1372,7 @@ TestGenExample
 TestGroupDemoConfig
 TestMultiRead
 TestName
+TestOnlySendCommandTimedRequestFlagWithNoTimedInvoke
 TESTPASSWD
 TestPICS
 TESTSSID

.spellcheck.yml

@@ -65,7 +65,7 @@ matrix:
       # converts markdown to HTML
       - pyspelling.filters.markdown:
     sources:
-      - '**/*.md|!third_party/**|!examples/common/**/repo/**|!docs/ERROR_CODES.md|!docs/clusters.md|!docs/testing/yaml_schema.md|!docs/testing/yaml_pseudocluster.md'
+      - '**/*.md|!third_party/**|!examples/common/**/repo/**|!docs/ERROR_CODES.md|!docs/clusters.md|!docs/testing/yaml_schema.md|!docs/testing/yaml_pseudocluster.md | !docs/testing/python.md | !docs/testing/ChipDeviceCtrlAPI.md'
     aspell:
       ignore-case: true
       camel-case: true