buildPgrxExtension: enable building workspaces

Doing

    cargoBuildFlags = [ "-p" "foo" ]

doesn't work here since this gets only passed to PGRX_BUILD_FLAGS which
in turn is used by `cargo build`.

This means that pgrx itself doesn't know of the workspace setup and
fails with

    Error:
    0: Couldn't get manifest path
    1: `pgrx` requires a root package in a workspace when `--package` is not specified.

This patch introduces another flag called `cargoPgrxFlags` to do the
right thing, i.e. to pass this to each pgrx invocation.

Using `cargoBuildFlags` is not reasonable here since `cargo build`
accepts flags that may not be valid when invoking `cargo pgrx` (e.g. `-r`).

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