feat(tlc): add support for tox

Add tox to automate testing across multiple environments, ensuring code
robustness and compatibility with different Python versions. This helps
ensure consistency in test environments so both development and CI
systems run tests uniformly, and simplifies the execution of tasks like
linting and other commands with a single command.

Change-Id: I522adb486e89abecb9a130941ce4cef31332193a
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
4 files changed