Improve the Makefile

[fpgmaas]

Changes

Some simple changes to the Makefile to make it a bit more user friendly. Running make help will show:

dev                  Create virtual environment and install development dependencies.
install              Install the package.
fmt                  Format the code in 'databricks' and 'tests' directories.
fmte                 Format the code in 'examples' directory.
lint                 Lint the code in 'databricks' directory.
test                 Run unit tests.
integration          Run integration tests.
benchmark            Run benchmark tests.
coverage             Generate and open the coverage report.
dist                 Build distribution packages.
clean                Clean up build artifacts.
help                 Show help for the commands.

Tests

• [x] make test run locally
• [x] make fmt applied
• [n/a] relevant integration tests applied