Implement stable DB Semantic Conventions for all DB Plugins

[maryliag]

Add environment variable option OTEL_SEMCONV_STABILITY_OPT_IN that includes database and database/dup options as recommended in the Database Migration Plan.

database - emit the stable database conventions, and stop emitting the old database conventions that the instrumentation emitted previously.
database/dup - emit both the old and the stable database conventions, allowing for a phased rollout of the stable semantic conventions.
The default behavior (in the absence of one of these values) is to continue emitting whatever version of the old database conventions the instrumentation was emitting previously.

Existing packages to be implemented:

• Postgres - Completed on feat(instrumentation-pg): update to stable semantic conventions #2881
• MySQL
• MySQL2 - feat(instrumentation-mysql2): support net.* and database semconv migration #3137
• MongoDB
• Redis
• Oracle
• Cassandra
• Knex
• Memcached - feat(instrumentation-memcached): support net.* and db.* semconv migra… #3169
• Tedious
• TypeORM