🎉 Source TiDB: add icon for TiDB source connector

[Daemonxiao]

What

Add icon to tidb-connector

Recommended reading order

1. airbyte-config/init/src/main/resources/icons/tidb.svg
2. airbyte-config/init/src/main/resources/seed/source_definitions.yaml

Pre-merge Checklist

Expand the relevant checklist and delete the others.

Updating a connector

Community member or Airbyter

• Grant edit access to maintainers (instructions)
• Secrets in the connector's spec are annotated with airbyte_secret
• Unit & integration tests added and passing. Community members, please provide proof of success locally e.g: screenshot or copy-paste unit, integration, and acceptance test output. To run acceptance tests for a Python connector, follow instructions in the README. For java connectors run ./gradlew :airbyte-integrations:connectors:<name>:integrationTest.
• Code reviews completed
• Documentation updated
  • Connector's README.md
  • Connector's bootstrap.md. See description and examples
  • Changelog updated in docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
• PR name follows PR naming conventions

Tests

Unit

Put your unit tests output here.

Integration

Put your integration tests output here.

Acceptance

Put your acceptance tests output here.

[marcosmarxm]

thanks @Daemonxiao