refactor: Use hasql-dynamic on RPC/POST/PUT/PATCH

Change callProc/createWriteStatement to H.Snippet.

Parametrize the inputs on the same SQLFragments by taking advantage
of hasql-dynamic-statements. It's not necessary to parametrize
every input, inlining with pgFmtLit can still be used for queries
that can't be parametrized(like SET LOCALs).

Also adds hasql-dynamic-statements to Nix and stack.

postgrest.cabal

@@ -62,6 +62,7 @@ library
                     , fast-logger               >= 2.4.5
                     , gitrev                    >= 1.2 && < 1.4
                     , hasql                     >= 1.4 && < 1.5
+                    , hasql-dynamic-statements  == 0.3.1
                     , hasql-pool                >= 0.5 && < 0.6
                     , hasql-transaction         >= 0.7.2 && < 1.1
                     , heredoc                   >= 0.2 && < 0.3
@@ -234,6 +235,7 @@ Test-Suite spec-querycost
                      , containers        >= 0.5.7 && < 0.7
                      , contravariant     >= 1.4 && < 1.6
                      , hasql             >= 1.4 && < 1.5
+                     , hasql-dynamic-statements  == 0.3.1
                      , hasql-pool        >= 0.5 && < 0.6
                      , hasql-transaction >= 0.7.2 && < 1.1
                      , heredoc           >= 0.2 && < 0.3