Restore/Add metrics in instrumentations

[codeboten]

This is an issue to track all the instrumentations that contained metrics in the metrics branch which need to be ported over to the new API:

• [instrumentation-requests] Restore metrics #1039
• [instrumentation-urllib] Restore metrics #1041
• [instrumentation-grpc] Restore metrics #1042
• [instrumentation-django] Restore metrics #1043
• Metrics instrumentation sqlalchemy #1143
• Metrics instrumentation urllib3 #1144
• Metrics instrumentation tornado #1145
• Metrics instrumentation starlette #1146
• Metrics instrumentation sqlite3 #1147
• Metrics instrumentation redis #1148
• Metrics instrumentation pyramid #1149
• Metrics instrumentation pymysql #1150
• Metrics instrumentaion pymongo #1151
• Metrics instrumentation pymemcache #1152
• Metrics instrumentation psycopg2 #1153
• Metrics instrumentation mysql #1154
• Metrics instrumentation flask #1155
• Metrics instrumentation fastapi #1156
• Metrics instrumentation falcon #1157
• Metrics instrumentation dbapi #1158
• Metrics instrumentation dbapi #1158
• Metrics instrumentation celery #1159
• Metrics instrumentation asgi #1160

For example usage of the metrics api, see the system-metrics instrumentation: https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/instrumentation/opentelemetry-instrumentation-system-metrics

[hectorhdzg]

I don't have permissions to edit the list, but it would be nice to track httpx as well, created following issue to track #3440