feat(functions) update functions template to match new 'server' style

[kallebysantos]

What kind of change does this PR introduce?

Feature

What is the new behavior?

Apply withSupabase helper from @supabase/server

Additional context

A new optional flag --auth was introduced for the functions new command, chose between the auth access template:

• always No credentials required - Open endpoints, wrappers that handle their own auth
• apikey Valid publishable key or secret key - Use respectively for Client-facing, key-validated endpoints or Server-to-server, internal calls
• user User JWT required - Authenticated user endpoints

Current default --auth always

--
Towards FUNC-563

[coveralls]

Coverage Report for CI Build 24260789105

Coverage decreased (-0.02%) to 63.782%

Details

• Coverage decreased (-0.02%) from the base build.
• Patch coverage: 7 uncovered changes across 2 files (19 of 26 lines covered, 73.08%).
• 7 coverage regressions across 2 files.

Uncovered Changes

File	Changed	Covered	%
cmd/functions.go	6	1	16.67%
internal/functions/new/new.go	20	18	90.0%

Coverage Regressions

7 previously-covered lines in 2 files lost coverage.

File	Lines Losing Coverage	Coverage
internal/utils/git.go	5	57.14%
internal/storage/rm/rm.go	2	80.61%

---

Coverage Stats

Relevant Lines:	15368
Covered Lines:	9802
Line Coverage:	63.78%
Coverage Strength:	7.05 hits per line

---

💛 - Coveralls

[kallebysantos]

WIP: Do not merge until @supabase/server be announced