feat(postgrest-config): add delete command to cli for convenience

[avallete]

What kind of change does this PR introduce?

Add a new delete subcommand to posgres-config allowing to restore override values back to default ones more easily.

Usage:

# Delete a single configuration parameter
supabase postgres-config delete --config max_connections

# Delete multiple configuration parameters (comma-separated, no spaces)
supabase postgres-config delete --config max_wal_size,effective_cache_size,shared_buffers

# Delete configuration without restarting the database
supabase postgres-config delete --config work_mem,maintenance_work_mem --no-restart

Closes DEVW-324

[linear]

DEVW-324 Fix allow to completely "delete" a postgres params

[coveralls]

Pull Request Test Coverage Report for Build 12883173988

Details

• 0 of 26 (0.0%) changed or added relevant lines in 1 file are covered.
• 8 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.2%) to 58.216%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/postgresConfig/delete/delete.go	0	26	0.0%

Files with Coverage Reduction	New Missed Lines	%
internal/debug/postgres.go	3	64.86%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 12866624157:	-0.2%
Covered Lines:	7589
Relevant Lines:	13036

---

💛 - Coveralls