Inplement option to set EnablePDB

[emagiz]

According to https://github.com/cloudnative-pg/cloudnative-pg/pull/3837/files#diff-67160e3b67586b511da3b6f279d73402e5bc70d9303786ddfda34aa99daae330R79, you can now set EnablePDB on the Cluster object to enable or disable PDB generation. This repository does not allow to set this yet, making it very difficult to perform maintanance. Specifically, the comments on https://github.com/cloudnative-pg/cloudnative-pg/issues/2570 are reasons to enable this in the chart.