[release] 1.10.0 - Custom Logger, [Internal] Initialization logging, SDK Key verification (#205)

- New Feature
- Custom Logger: A new callback interface can be define how to log
warning / info. The default behavior is println (System.out.println). If
custom logger is provided, call back function will be called instead of
printout to console

- Internal
- Always log initialization diagnostics data, so we can better monitor
and debug the health of sdk
- SDK Key verification: check if server response is the same sdk key. If
sdk key mismatched between sdk and server response, response will be
disregarded.
   - Fix a concurrency bug on internal logging class





>Included In This Release
>- 442490b Xin Li
>   - Add custom logger (#203)
>- 7b8b8cb Xin Li
>   - Fix diagnostics core api concurrency issue (#202)
>- f433b71 sroyal-statsig
>   - SDK Key Verification (#201)
>- d8fe056 Xin Li
>   - Merge pull request #198 from statsig-io/core_diag
>- d7b6622 Xin Li
>   - Disable diagnostics does not affect initialize

Author: xinlili-statsig

gradle.properties

@@ -6,7 +6,7 @@ RELEASE_SIGNING_ENABLED=true
 
 GROUP=com.statsig.serversdk
 POM_ARTIFACT_ID=serversdk
-VERSION_NAME=1.9.0
+VERSION_NAME=1.10.0
 
 POM_NAME=Statsig Server SDK
 POM_DESCRIPTION=A feature gating and a/b testing library for statsig

src/main/kotlin/com/statsig/sdk/StatsigMetadata.kt

@@ -6,7 +6,7 @@ import com.google.gson.annotations.SerializedName
 import java.util.Properties
 import java.util.UUID
 
-private const val VERSION = "1.9.0"
+private const val VERSION = "1.10.0"
 
 internal data class StatsigMetadata(@SerializedName("sdkType") var sdkType: String = "java-server", @SerializedName("sessionID") var sessionID: String = UUID.randomUUID().toString(), @SerializedName("languageVersion") var languageVersion: String = System.getProperty("java.version"), @SerializedName("exposureLoggingDisabled") var exposureLoggingDisabled: Boolean? = null) {
     @SerializedName("sdkVersion")