Temporal Table Function Samples for Java Do Not Work As-Is, And Some Functions Are Deprecated

In the java documentation for the Temporal Table Function, there are two issues with the APIs as-is.

• Defining the temporal table calls `tEnv.registerFunction` which is a deprecated API since v1.11, favoring `createTemporarySystemFunction` instead.
• In the Temporal Table Function Join syntax, calling `joinLateral($("rates(order_time)")` elicits the following error:

Cannot resolve field [rates(order_time)] 

For point 1, I am proposing we replace `tEnv.registerFunction()` with `tEnv.createTemporarySystemFunction`.

For point 2, I am proposing we replace:

Table result = orders.joinLateral($("rates(order_time)"), $("orders.currency = rates.currency")).select($("(o_amount * r_rate).sum as amount"));

with

Table result = orders.joinLateral(call("rates", $("o_proctime")), $("o_currency").isEqual($("r_currency"))).select($("(o_amount").times($("r_rate")).sum().as("amount")); 

Sources for corrections:

• https://nightlies.apache.org/flink/flink-docs-release-1.11/api/java/org/apache/flink/table/api/TableEnvironment.html#registerFunction-java.lang.String-org.apache.flink.table.functions.ScalarFunction-
• https://nightlies.apache.org/flink/flink-docs-master/docs/dev/table/tableapi/#join-with-temporal-table{}