Support --format=plain option for pg_dump

[fblackburn1]

I would like to have an option to choose how pg_dump will format the database (i.e. plain vs custom)
I could make a PR to support it, but I need to know
Would you interested to have this kind of option?
What do you think of --dump-format (plain, custom directory, tar) and --dump-compress (0..9) ?
Or do you prefer something more generic to pass any pg_dump options to the command?

[hkage]

Great idea! You are welcomed to add this option to the dump-feature.

In my opinion and if it isn't too time consuming, we could pass additional (and optional) pg_dump arguments, e.g. by using --dump-file (which activates the dump creation) and --dump-options="--compress=9 --format=t" (or dump-arguments) for all optional arguments. This would make the dump creation more flexible and we don't have to re-implement every argument/option if other users would like to see them.

[fblackburn1]

For records, I created a PR to add --dump-options
Since this branch has a lot of conflict with the --parallel option branch, I decided to use this parallel branch as base branch (and cannot open PR in this repo until the first one got merged)

edit: Will be fixed by #63