chore: add checker to detect flask app running on insecure host

[MashyBasker]

Test logs:

echo "Testing built-in rules..."
Testing built-in rules...
./bin/globstar test -d checkers/
Running test case: avoid_add.yml
Running test case: avoid_latest.yml
Running test case: avoid_sudo.yml
Running test case: dangerous_eval.yml
Running test case: app-run-with-bad-host.yml
Running test case: avoid-marksafe.yml
Running test case: context-autoescape-off.yml
Running test case: filter-issafe.yml
Running test case: format-html-param.yml
Running test case: safe-string-extend.yml
All tests passed        globstar.dev/cmd/globstar               coverage: 0.0% of statements
        globstar.dev/pkg/config         coverage: 0.0% of statements
        globstar.dev/pkg/cli            coverage: 0.0% of statements
ok      globstar.dev/pkg/analysis       0.005s  coverage: 22.7% of statements
Total coverage: 13.9%

[vercel]

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
globstar	⬜️ Ignored (Inspect)	Visit Preview		Mar 1, 2025 4:42am

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