fix(functions): set request timeout to 150 seconds when invoking functions

[grdsdev]

What kind of change does this PR introduce?

Bug fix
Close #727

What is the current behavior?

No request timeout defined, which uses default URLSession timeout which is 60 seconds.

What is the new behavior?

Allow to specify a custom value for timeout a per-request basis, (internally, not configurable by the user)
Set all invoke functions requests timeout to 150 seconds

Additional context

https://supabase.com/docs/guides/functions/limits

[coveralls]

Pull Request Test Coverage Report for Build 15469746645

Details

• 5 of 6 (83.33%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall first build on guilherme/clibs-190-edge-function-timeout-60-seconds at 75.659%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Sources/Helpers/HTTP/HTTPRequest.swift	3	4	75.0%

Totals
Change from base Build 15390678797:	75.7%
Covered Lines:	5225
Relevant Lines:	6906

---

💛 - Coveralls

[grdsdev]

@dshukertjr not sure if this happens in Flutter too, does HTTPClient has a default timeout for the requests? If that is the case, this will need to be fixed on flutter too.