Make NameValidationScheme configurable

[yeya24]

Is your feature request related to a problem? Please describe.
Now NameValidationScheme is hardcoded to legacy. We want to allow users to enable UTF-8 validation mode behind a flag.

Describe the solution you'd like

Add a flag to turn on UTF-8 validation mode. Make sure to cover unit tests

[yumosx]

Hi, @yeya24 can I help with it?

[yeya24]

@yumosx Yes please go ahead.

[av153k]

@yumosx Are you working on it? If not, can I try this one?

[yumosx]

I've been quite busy recently, you can try it.

[av153k]

Okay. Thank you. @yumosx

[av153k]

Hello @yeya24, This might be a bit silly to ask, but I wanted to confirm how the user would set that flag? By CMD variable, env variable or something else ??

[yeya24]

It will be both a flag and field in the config file.

[av153k]

Okay. Thank you.

[av153k]

Hello @yeya24, I have created a draft PR for this commit. Adding tests is left. Just wanted to confirm by you, if I am on the right path in implementing the changes required by this issue. Once you confirm, I will add the tests and make the PR ready for review. I am sorry for doing this, I don't have much experience in OSS contribution, so.