Dynamically use setMethod() for multiple dispatch

[krlmlr]

Goal: every S4 method in the wrapped class should get its corresponding method from us.

Example: dbQuote*() .

[krlmlr]

library(RPostgres)
methods::findMethodSignatures("dbQuoteString")
#>      conn            x          
#> [1,] "DBIConnection" "ANY"      
#> [2,] "DBIConnection" "character"
#> [3,] "DBIConnection" "SQL"      
#> [4,] "PqConnection"  "character"
#> [5,] "PqConnection"  "SQL"

^{Created on 2020-12-22 by the reprex package (v0.3.0)}