feat: resolve datascript query inputs with Logseq DSL for plugins

[pengx17]

1. allow plugins to pass in :today etc in logseq.DB.datascriptQuery

logseq.DB.datascriptQuery(
  `[:find (pull ?h [*])
            :in $ ?start ?next
            :where
            [?h :block/marker ?marker]
            [?h :block/refs ?p]
            [?p :block/journal? true]
            [?p :block/journal-day ?d]
            [(> ?d ?start)]
            [(< ?d ?next)]]`,
  ":today",
  ":7d-after"
);

2. fix a display issue of query DSLs

[cnrpman]

LGTM

[pengx17]

should fix #5045