[CALCITE-984] Massive cleanup of Avatica JSON docs
[CALCITE-984] Massive cleanup of Avatica JSON docs

* Added docs for many missing messages
* Ensured Requests/Responses/Misc were sorted alphabetically
* Added missing `rpcMetadata` fields
* Changed styling of enum list items

xhoong/incubator-calcite,joshelser/calcite-avatica,jcamachor/calcite,vlsi/calcite,apache/calcite,sreev/incubator-calcite,looker-open-source/calcite-avatica,looker-open-source/calcite,dindin5258/calcite,googleinterns/calcite,datametica/calcite,jcamachor/calcite,googleinterns/calcite,apache/calcite,joshelser/incubator-calcite,apache/calcite-avatica,datametica/calcite,joshelser/calcite-avatica,wanglan/calcite,dindin5258/calcite,wanglan/calcite,vlsi/incubator-calcite,joshelser/incubator-calcite,vlsi/calcite,amoghmargoor/incubator-calcite,jcamachor/calcite,apache/calcite-avatica,vlsi/incubator-calcite,hsuanyi/incubator-calcite,apache/calcite-avatica,looker-open-source/calcite-avatica,joshelser/incubator-calcite,looker-open-source/calcite,adeshr/incubator-calcite,xhoong/incubator-calcite,yeongwei/incubator-calcite,minji-kim/calcite,looker-open-source/calcite,looker-open-source/calcite-avatica,joshelser/incubator-calcite,apache/calcite-avatica,jcamachor/calcite,yeongwei/incubator-calcite,googleinterns/calcite,wanglan/calcite,sreev/incubator-calcite,looker-open-source/calcite,datametica/calcite,googleinterns/calcite,julianhyde/calcite,looker-open-source/calcite-avatica,dindin5258/calcite,googleinterns/calcite,minji-kim/calcite,hsuanyi/incubator-calcite,minji-kim/calcite,vlsi/calcite,xhoong/incubator-calcite,apache/calcite,googleinterns/calcite,minji-kim/calcite,apache/calcite,adeshr/incubator-calcite,dindin5258/calcite,vlsi/calcite,hsuanyi/incubator-calcite,sreev/incubator-calcite,arina-ielchiieva/calcite,yeongwei/incubator-calcite,arina-ielchiieva/calcite,looker-open-source/calcite,arina-ielchiieva/calcite,apache/calcite,adeshr/incubator-calcite,julianhyde/calcite,jcamachor/calcite,amoghmargoor/incubator-calcite,julianhyde/calcite,vlsi/calcite,wanglan/calcite,julianhyde/calcite,b-slim/calcite,julianhyde/calcite,datametica/calcite,dindin5258/calcite,apache/calcite,looker-open-source/calcite-avatica,adeshr/incubator-calcite,joshelser/calcite-avatica,b-slim/calcite,xhoong/incubator-calcite,datametica/calcite,looker-open-source/calcite,b-slim/calcite,yeongwei/incubator-calcite,minji-kim/calcite,vlsi/calcite,dindin5258/calcite,amoghmargoor/incubator-calcite,hsuanyi/incubator-calcite,b-slim/calcite,sreev/incubator-calcite,jcamachor/calcite,arina-ielchiieva/calcite,arina-ielchiieva/calcite,datametica/calcite,apache/calcite-avatica,b-slim/calcite,julianhyde/calcite,amoghmargoor/incubator-calcite