[Feature] Support LiteralContext to replace the default STRING literal

Currently Pinot uses STRING type to store literal [in ExpressionContext](https://github.com/apache/pinot/blob/89836a57c0d2346e4a04d43c8a9d8ef1e7900b18/pinot-common/src/main/java/org/apache/pinot/common/request/context/ExpressionContext.java)

This was creating some confusion in resolving SQL queries for example: `array_remove_string(mvStringCol, 2)` actually removes the literal string `"2"` from the myStringCol because
1. auto type conversion from int value to STRING in ExpressionContext, then
2. implicit type cast to INT, then
3. eventually cast to STRING to match the `arrayRemoveString` signature of `args(String[], String)`

Propose to create a `LiteralContext` similar to the FunctionContext and FilterContext. it holds
- `LiteralType` extracted from the [Thrift Literal](https://github.com/apache/pinot/blob/89836a57c0d2346e4a04d43c8a9d8ef1e7900b18/pinot-common/src/thrift/query.thrift#L59-L68)
- `LiteralValue` which is the optional literal value

CC @Jackie-Jiang @xiangfu0 ^