feat(go-sdk): Allow StoreId to be overridden per-request

[jimmyjames]

Enables overriding the store ID using client.go for all APIs except for ListStores and CreateStore.

Description

For endpoints that use the store ID, a StoreId was added to its respective request options. If set, it will be used when making the request. If not set, the store ID configured for the client will be used instead.

client, err := NewSdkClient(&ClientConfiguration{
         ApiUrl:  os.GetEnv("FGA_API_URL"),     
         StoreId: os.GetEnv("FGA_STORE_ID"),
})

if err != nil {
        // handle error
}

// Uses StoreId from ClientConfiguration
got, err := client.GetStore(context.Background()).Execute()
if err != nil {
        // ....
}
fmt.Printf("Got store %v", got.Name)

// store can be overridden
storeOverrideOptions := ClientGetStoreOptions{
    StoreId: "01RXYB9SWCFGFCX1QZA9DN8T4Y",
}

got, err = client.GetStore(context.Background()).Options(storeOverrideOptions).Execute()
if err != nil {
    // ....
}

fmt.Printf("Got store %v", got.Name)

References

Completes the go-sdk work captured in #118

Review Checklist

• [x] I have clicked on "allow edits by maintainers".
• [ ] I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• [x] The correct base branch is being used, if not main
• [x] I have added tests to validate that the change in functionality is working as expected

[jimmyjames]

Will update this once again after https://github.com/openfga/sdk-generator/pull/366 is merged, then update the go-sdk PR from generation.