ENH: Transition CIs to GHA using ITK remote module build actions

Transition CIs to GHA using ITK remote module build actions:
- Add the ITK remote module build GHA workflow file.
- Remove Appveyor, CircleCI and Travis CI config files.

Take advantage of the commit to add the clang format linter GHA workflow
file.

Update the `README.rst` file badges accordingly.

.github/workflows/build-test-package.yml

@@ -0,0 +1,20 @@
+name: Build, test, package
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  cxx-build-workflow:
+    uses: InsightSoftwareConsortium/ITKRemoteModuleBuildTestPackageAction/.github/workflows/[email protected]
+
+  python-build-workflow:
+    uses: InsightSoftwareConsortium/ITKRemoteModuleBuildTestPackageAction/.github/workflows/[email protected]
+    secrets:
+      pypi_password: ${{ secrets.pypi_password }}

README.rst

@@ -1,20 +1,14 @@
 The Lesion Sizing Toolkit (LSTK)
 ================================
 
-.. |CircleCI| image:: https://circleci.com/gh/InsightSoftwareConsortium/LesionSizingToolkit.svg?style=shield
-    :target: https://circleci.com/gh/InsightSoftwareConsortium/LesionSizingToolkit
+.. image:: https://github.com/InsightSoftwareConsortium/LesionSizingToolkit/actions/workflows/build-test-package.yml/badge.svg
+    :target: https://github.com/InsightSoftwareConsortium/LesionSizingToolkit/actions/workflows/build-test-package.yml
+    :alt: Build Status
 
-.. |TravisCI| image:: https://travis-ci.org/InsightSoftwareConsortium/LesionSizingToolkit.svg?branch=master
-    :target: https://travis-ci.org/InsightSoftwareConsortium/LesionSizingToolkit
+.. image:: https://img.shields.io/badge/License-Apache%202.0-blue.svg
+    :target: https://github.com/InsightSoftwareConsortium/LesionSizingToolkit/blob/master/LICENSE
+    :alt: License
 
-.. |AppVeyor| image:: https://img.shields.io/appveyor/ci/InsightSoftwareConsortium/lesionsizingtoolkit.svg
-    :target: https://ci.appveyor.com/project/InsightSoftwareConsortium/lesionsizingtoolkit
-
-=========== =========== ===========
-   Linux      macOS       Windows
-=========== =========== ===========
-|CircleCI|  |TravisCI|  |AppVeyor|
-=========== =========== ===========
 
 Overview
 --------