Fixes #271

Summary

• --strict formats warnings like errors and exits with status 1
• extra message output of check-declare-file is hidden
• set allow-errors to 'always' in code so that all files are linted

After the change:

> ~/git/eask-cli/bin/eask lint declare --strict
`js-comint.el` with check-declare
js-comint.el:148:Warning (check-declare): said ‘nvm--find-exact-version-for’ was defined in .eask/31.0.50/elpa/nvm-20240921.1901/nvm.el: arglist mismatch


`test-js-comint.el` with check-declare
No issues found

(Total of 2 files have checked)

The output line is formatted like an error and the exit code is 1.

Questions

Perhaps 'Warning (check-declare)' should be removed from the output?
e.g. this seems like a better message

js-comint.el:148: ‘nvm--find-exact-version-for’ was defined in .eask/31.0.50/elpa/nvm-20240921.1901/nvm.el: arglist mismatch