[Do not merge] Re arch support extra ops

[mbartling]

• Add additional operator support for target rearch.
• Fix bug in TFLITE parser where all tensors are treated as having quantization params.
• Add placeholder list for TF Lite side parser, so we can clarify and differentiate between frontend Op support and Backend Op support

[dboyliao]

You need to update the namespaces for the _Operators.
Also, you need to properly lower the ops such as updating op_info.code_gen_attributes['namespaces'].

Of course, the conflicts need to be resolved too.

[mbartling]

Of course, the conflicts need to be resolved too.

Done