Enhance OAL engine core
* Fix `funcParamExpression` and `literalExpression` can't be used in the same aggregation function.
* Support cast statement in the OAL core engine.
* Support `(str->long)` and `(long)` for string to long cast statement.
* Support `(str->int)` and `(int)` for string to int cast statement.
* Support Long literal number in the OAL core engine.
* Support literal `string` as parameter of aggregation function.
* Add `attributeExpression` and `attributeExpressionSegment` in the OAL grammar tree to support `map` type for the
attribute expression.
Besides added UTs, I locally tested these OAL scripts
```
mq_consume_latency = from((str->long)Service.tag["transmission.latency"]).longAvg();
mq_consume_latency = from((long)Service.tag["transmission.latency"]).longAvg();
mq_consume_latency = from((str->long)Service.tag["transmission.latency"]).filter((str->long)tag["transmission.latency"] > 0L).longAvg();
```
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