Instrument `botocore.signers.RequestSigner.generate_presigned_url`

[sam-mosleh]

What problem do you want to solve?

The current OpenTelemetry instrumentation for botocore only instruments BaseClient._make_api_call, which means several AWS SDK operations that don't go through this code path are not traced.

Example: RDS IAM Authentication

rds_client = boto3.client('rds')
token = rds_client.generate_db_auth_token(
    DBHostname='mydb.cluster-123456.us-east-1.rds.amazonaws.com',
    Port=3306,
    DBUsername='myuser'
)

Describe the solution you'd like

I would like the OpenTelemetry botocore instrumentation to also trace operations like botocore.signers.RequestSigner.generate_presigned_url

Describe alternatives you've considered

No response

Additional Context

No response

Would you like to implement a fix?

None

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