Add stage 0 proposals

[pd4d10]

[ljharb]

@pd4d10 thanks for the PR! typically it's up to champions to put their own proposals on this list, for future reference.

[legendecas]

Notably, the not that hard "requirement"s for the list say that:

• planned to be presented to the committee by a TC39 champion, or
• have been presented to the committee and not rejected definitively, but have not yet achieved any of the criteria to get into stage 1.

See https://github.com/tc39/proposals/blob/master/stage-0-proposals.md#stage-0-proposals.

IIUC, in that sense, the proposals listed here should be planned to be presented or have been presented. After all, there are no entrance criteria for stage 0. Proposals that are not listed here did not mean they are not valid stage 0 proposals.

[six-ponies]

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