feat: filter top-level resource with embed filter

This is enabled by adding `!inner` to the embedded resource

/projects?select=*,clients!inner(*)&clients.id=eq.12

This behaviour can be enabled by default with the config option

db-embed-default-join='inner'

Which saves the need for specifying `!inner` on every request.
If this is enabled, the previous behavior can be restored
per request by specifying `!left`  on the embedded resource.

/projects?select=*,clients!left(*)&clients.id=eq.12`

Tested on M20/02M/M2M relationships, views, RPC.

postgrest.cabal

@@ -176,6 +176,7 @@ test-suite spec
                       Feature.DeleteSpec
                       Feature.DisabledOpenApiSpec
                       Feature.EmbedDisambiguationSpec
+                      Feature.EmbedInnerJoinSpec
                       Feature.ExtraSearchPathSpec
                       Feature.HtmlRawOutputSpec
                       Feature.InsertSpec