[release] v1.27.0 - API Overrides, initialize timeout bug fix, hashin…

…g exposures (#213)

### New Features
- Added options to override APIs used for /download_config_specs,
/get_id_lists, /log_event.
  ### Improvements
  - Allow omitempty on User struct
  - Support hashing secondary exposures on GetClientInitializeResponse
  ### Fixes
  - Fixed a bug where the sdk doesn't not poll config sync if timed out.





>Included In This Release
>- d61c079 kat-statsig
>   - add hash algo + hash secondary and undelegated exposures (#209)
>- 6c9e4ad kat-statsig
>   - omit empty on non id fields (#211)
>- 2d84feb kat-statsig
>   - fix flakey tests (#210)
>- 042361a kenny-statsig
>   - API Overrides (#205)
>- bad9d89 kenny-statsig
>   - Allow UAParser and CountryLookup to load in case of timeout (#207)
>- a17493f kat-statsig
>   - set timeout on client init (#203)
>- 9b5e607 kenny-statsig
>   - Fix race condition in test (#206)

statsig_metadata.go

@@ -14,7 +14,7 @@ type statsigMetadata struct {
 func getStatsigMetadata() statsigMetadata {
 	return statsigMetadata{
 		SDKType:         "go-sdk",
-		SDKVersion:      "v1.26.0",
+		SDKVersion:      "v1.27.0",
 		LanguageVersion: runtime.Version()[2:],
 		SessionID:       SessionID(),
 	}