GET requests should benefit from read-only-replica

[norbertbede]

GET requests should benefit from read-only-replica implementation
similar to: https://wiki.idempiere.org/en/NF6.2_Reporting_from_Read-Only_Replica

https://mattermost.idempiere.org/idempiere/pl/o8mu6jt593nyzbjk9ausmwyjze

[CarlosRuiz-globalqss]

I'm not sure how to do this, so, a pull request would be appreciated.

I think by default the system must keep reading from master, and adding maybe a parameter to the GET methods to explicitly instruct to try replica. For example something like $replica=true

[CarlosRuiz-globalqss]

Another issue to take into account, the reading from read-only replica was implemented opening/closing a direct connection, I mean, no connection pool, which must make it a lot slower than using the pool.

So, as it is, if you use extensively GET in read-only replica it will probably suffer from big slowness, would be better to implement a connection pool on the replica before using this extensively.