Make sure pymysql instrumentation follows semantic conventions

[Anu-MT]

Hi, I would like to work on the issue. Would you assign this to me?Any guidance will be greatly appreciated.

[srikanthccv]

pymysql instrumentation adds several attributes to the spans it creates. Some of them could be outside the semantic conventions defined for databases here https://github.com/open-telemetry/semantic-conventions/blob/main/docs/database/README.md. We need to update the instrumentation to follow the updated semantic conventions.

[Joice-crypto]

Hello, is anyone currently working on this? Could I give it a try?

[emdneto]

@Joice-crypto sure. Please feel free to open a PR