Failure to parse DECIMAL(<scale>, <precision>)

[dlurton]

PartiQL> cast(foo as decimal(2, 2))
   | !!
org.partiql.lang.syntax.ParserException: Apparently DataType needs multiple lengths, sizes, etc
	Parser Error: at line 1, column 13: Internal error - malformed parse tree detected, <UNKNOWN> : <UNKNOWN>

	at org.partiql.lang.syntax.SqlParser$ParseNode.errMalformedParseTree(SqlParser.kt:160)
	at org.partiql.lang.syntax.SqlParser.toDataType(SqlParser.kt:722)
	at org.partiql.lang.syntax.SqlParser.toExprNode(SqlParser.kt:305)
	at org.partiql.lang.syntax.SqlParser.parseExprNode(SqlParser.kt:1919)
	at org.partiql.cli.Repl$parsePartiQLWithFilters$1.invoke(Repl.kt:267)
	at org.partiql.cli.Repl$parsePartiQLWithFilters$1.invoke(Repl.kt:106)
	at org.partiql.cli.Repl$executeTemplate$totalMs$1.invoke(Repl.kt:212)
	at org.partiql.cli.Repl$executeTemplate$totalMs$1.invoke(Repl.kt:106)
	at org.partiql.cli.Timer$DefaultImpls.timeIt(Repl.kt:96)
	at org.partiql.cli.Repl$1.timeIt(Repl.kt:112)
	at org.partiql.cli.Repl.executeTemplate(Repl.kt:211)
	at org.partiql.cli.Repl.parsePartiQLWithFilters(Repl.kt:265)
	at org.partiql.cli.Repl.run(Repl.kt:316)
	at org.partiql.cli.Main.runRepl(main.kt:155)
	at org.partiql.cli.Main.main(main.kt:140)
ERROR! 

Note that cast(foo as decimal(1)) works without issue however.

Tasks outlined by this issue:

1. Update SqlParser to parse multiple arguments for DECIMAL and NUMERIC when they are used with 2 arguments. (Also verify that these are the only two types that include more than one parameter.)
2. Add tests to SqlParserTests for those types when used with more than one argument.