[TVMScript] Evaluator, core parser, var table

[cyx-6]

This PR introduces Evaluator, core parser, var table as part of #12442

Co-authored-by: yongwww yongcale@gmail.com

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• No users to tag found in teams: tvmscript _{See #10317 for details}
• Built docs for commit 08d461a can be found here.

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[MasterJH5574]

LGTM. Thanks @cyx-6 for the hard work!

[leandron]

A follow-up change is required, following what was discussed in https://discuss.tvm.apache.org/t/reminder-of-our-code-review-guidelines/14388

In this case it is not by the face that it was merged too early, but probably because of the comments that might be confusing to some users.

[tqchen]

Thanks for the suggestion.

This is an API used by TVMScript internally, and the particular remark is only making an example and such example won't add confusions to the use of the API. Nor will it break any other modules in tvm.

If any one of the current TVMScript maintainers feels it is out of place. I think they should be able to come and fix it. But my take is that they are not, as such I would hope to appreciate the volunteering time effort of the module maintainers and let them make the call.

Thank you