LLVM JIT function would support append_slice and encode columns with input row

[tobegit3hub]

Now we support parameter append slice to append input row columns to window output columns. We need to support generate single row with append row columns at one time.

[tobegit3hub]

UnsafeRowOpt relies on this feature to get SingleSliceRowFormat and do not need to append columns in offline.

[jingchen2222]

1. We can add a bool filed need_append_input into RowFnLetIRBuilder to enable/disable append an input.
2. RowFnLetIRBuilder.need_append_input can be set as false by default and can be set from PhysicalWindowProjectNode codegen logic
3. Status EncodeBuf(...) support Encode with appending input_row.

[aceforeverd]

#3731 related