Enable JWT verification when serving all functions

[laktek]

What kind of change does this PR introduce?

• Updates edge-runtime to 1.2.12 (the latest release).
• Provide a main function script as required by the newer release of edge-runtime.
• Enable JWT verification for functions via the main function.

What is the current behavior?

No JWT verification when serving all functions via supabase function serve.

What is the new behavior?

Serving all functions will default to verify JWT unless --no-verify-jwt flag is passed.

Additional context

Fixes #873.

Also, the new version of edge-runtime should include Deno.errors (as mentioned in the ticket supabase/edge-runtime#211)

Tested supabase start and it also seems to work.

[coveralls]

Pull Request Test Coverage Report for Build 4655797259

• 20 of 22 (90.91%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.06%) to 60.689%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/functions/serve/serve.go	20	22	90.91%

Totals
Change from base Build 4654309727:	0.06%
Covered Lines:	4159
Relevant Lines:	6853

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💛 - Coveralls

[laktek]

Thanks for fixing those @soedirgo. Shall we merge this and do a follow up PR for per function configs?

[soedirgo]

Yea sounds good.