Change relay syntax & parser to make it accept BYODT

[jhlee525]

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Continuation of https://github.com/apache/tvm/pull/10008

I was struggling to parse some relay graphs with custom data type(BYODT), generating parsing error.

I found the issue and above PR, tried to test it. All work nicely with this patch.

The only problem is that it is not being merged because of some CI problem.

Above PR staled 3~4 month, so I decided to complete it. I just merged the latest code and checked that all lint stages are passing(tests/scripts/task_lint.sh). Currently no code is added or removed compare to above PR. If the original PR can be merged, than it can be deleted.

[gussmith23]

Apologies for dropping the previous PR. Got lost in my GitHub notifications. Let me know if you need help.

[jhlee525]

@leandron All right I'll change it to "Change relay syntax & parser to make it accept BYODT"

@gussmith23 Never mind, Everything is now ok and ready-to-merge. thank you for great PR!

[rebel-jhlee]

Is there any progress going on?

[gussmith23]

@leandron

[rebel-jhlee]

@leandron could you tell me it can be merged or not?

Our group always patching this branch to the state-of-the-art TVM code, to parse the relay with custom type