fix: remove options structs in go sdk (#5907)

* test: add tests to verify passing slice and pointer types

Signed-off-by: Justin Chadwell <[email protected]>

* fix: fix variadic args for go sdk functions

Signed-off-by: Justin Chadwell <[email protected]>

* feat: remove opt structs in go sdk

See the full PR for more info - but essentially, determining "opt"iness
is difficult: doing by pointer is weird, doing with names feels too
magic, etc.

So we just remove the feature and now support two different ways of
passing opts:
- As individual args directly
- As inline structs

Signed-off-by: Justin Chadwell <[email protected]>

* docs: update zenith docs to not use Opts structs

Signed-off-by: Justin Chadwell <[email protected]>

* fix: resolve code review comments

Signed-off-by: Justin Chadwell <[email protected]>

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Signed-off-by: Justin Chadwell <[email protected]>