Add codespell support (config, workflow to detect/not fix) and make it fix some typos

.codespellrc

@@ -0,0 +1,6 @@
+[codespell]
+# Ref: https://github.com/codespell-project/codespell#using-a-config-file
+skip = .git*,.codespellrc
+check-hidden = true
+# ignore-regex = 
+ignore-words-list = ans

.github/workflows/codespell.yml

@@ -0,0 +1,25 @@
+# Codespell configuration is within .codespellrc
+---
+name: Codespell
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Annotate locations with typos
+        uses: codespell-project/codespell-problem-matcher@v1
+      - name: Codespell
+        uses: codespell-project/actions-codespell@v2

test/tZarrCreate.m

@@ -198,7 +198,7 @@ function invalidSizeInput(testcase)
         end
 
         function invalidDatatype(testcase)
-            % Verify the error when an usupported datatype is used.
+            % Verify the error when an unsupported datatype is used.
             testcase.verifyError(@()zarrcreate(testcase.ArrPathWrite,...
                 testcase.ArrSize,Datatype="bla"),...
                 'MATLAB:validators:mustBeMember');