fix vvisp utils

[JhChoy]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/HAECHI-LABS/vvisp/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• PR to dev branch

#93 should be merged first!

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

• vvisp-utils/getConfigRoot was async function
• privateKey was fixed to 12 words

What is the new behavior?

• vvisp-utils now exports compilerSupplier and filterPrivateKey
• vvisp-utils/getConfigRoot changes to sync function
• privateKey has no more words length limitation

Does this PR introduce a breaking change?

• Yes
• No

[JhChoy]

It should be merged to 1.0.0 and is duplicated with #101