Update the c3 template to use placeholders

[vicb]

This PR update the c3 template to use the placeholders recently introduced in c3 (but not released yet).

The placeholders enabled to correctly setup the self binding name - it should match the worker name.

Notes:

• The current c3 template overrides files from this template with those files
• The changes have been tested with the current released version of c3
• The changes have been tested with the future version of c3 (see this PR)
• There is also a wrangler.jsonc template used when the project does not have one. It has been updated to use the same placeholder format and the corresponding code has been updated.

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Latest commit: d4dab2a

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commit: d4dab2a

[petebacondarwin]

LGTM although I am not sure how this can work with the current C3? Won't you end up with a project that has an invalid wrangler.jsonc where the name is <WORKER_NAME>?

[vicb]

LGTM although I am not sure how this can work with the current C3? Won't you end up with a project that has an invalid wrangler.jsonc where the name is <WORKER_NAME>?

No because the wrangler.jsonc in this PR is not used by the current c3. c3 has its own version of wrangler.jsonc - that's the first bullet point in the description (arguably the link was wrong and I just fixed that).

And thanks for the review