feat: add standard client headers

[grdsdev]

What kind of change does this PR introduce?

Bug fix, feature, docs update, ...

What is the current behavior?

Please link any relevant issues here.

What is the new behavior?

Feel free to include screenshots if it includes visual changes.

Additional context

Add any other context or screenshots.

[linear]

CLIBS-117 [supabase-swift] Send standard client headers on all requests

[coveralls]

Pull Request Test Coverage Report for Build 13698748167

Details

• 25 of 31 (80.65%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.004%) to 74.835%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Sources/Helpers/Version.swift	0	6	0.0%

Totals
Change from base Build 13696472420:	0.004%
Covered Lines:	5100
Relevant Lines:	6815

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 13698990428

Details

• 25 of 31 (80.65%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 75.348%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Sources/Helpers/Version.swift	0	6	0.0%

Totals
Change from base Build 13696472420:	0.5%
Covered Lines:	5135
Relevant Lines:	6815

---

💛 - Coveralls