New version: TidierDB v0.3.0

[JuliaRegistrator]

• Registering package: TidierDB
• Repository: https://github.com/TidierOrg/TidierDB.jl
• Created by: @drizk1
• Version: v0.3.0
• Commit: 8c9838114c6bcbe11988a582fcd326f42d876e44
• Reviewed by: @drizk1
• Reference: TidierOrg/TidierDB.jl@8c98381#commitcomment-144636143
• Description: Tidier database analysis in Julia, modeled after the dbplyr R package.
• Release notes:

- Introduces package extensions for:
    - Postgres, ClickHouse, MySQL, MsSQL, SQLite, Oracle, Athena, and Google BigQuery
    - [Documentation](https://tidierorg.github.io/TidierDB.jl/latest/examples/generated/UserGuide/getting_started/) updated for using these backends.  
- Change `set_sql_mode()` to use types not symbols (ie `set_sql_mode(snowflake())` not `set_sql_mode(:snowflake)`)

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