clickhouse_info: add roles info per user

[Andersson007]

SUMMARY

clickhouse_info: add roles info per user

[Andersson007]

ready for review

[aleksvagachev]

@Andersson007 Thank you for your contribution.

1. What a file .keep?
2. Will we add information about the roles? According to the official documentation, GRANT can also be performed for roles.

[Andersson007]

@Andersson007 Thank you for your contribution.

1. What a file .keep?
2. Will we add information about the roles? According to the official documentation, GRANT can also be performed for roles.

@aleksvagachev

1. .keep would prevent the fragments directory to be not included when it's empty. it's a common practice to use .keep
2. do you mean to expand user role info more? if yes, not in this PR, but you can file an issue and implement it or leave it for other volunteers

[Andersson007]

@aleksvagachev thanks for reviewing and merging!