use otel for observability (#635)

## Description:

## Please complete the following:

- [ ] I have added screenshots for all UI updates
- [ ] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [ ] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

<DISCORD USERNAME>

Co-authored-by: evan <openfrontio@gmail.com>

src/core/configuration/Config.ts

@@ -44,6 +44,10 @@ export interface ServerConfig {
   r2Endpoint(): string;
   r2AccessKey(): string;
   r2SecretKey(): string;
+  otelEndpoint(): string;
+  otelUsername(): string;
+  otelPassword(): string;
+  otelEnabled(): boolean;
 }
 
 export interface NukeMagnitude {

src/core/configuration/DefaultConfig.ts

@@ -25,6 +25,20 @@ import { pastelTheme } from "./PastelTheme";
 import { pastelThemeDark } from "./PastelThemeDark";
 
 export abstract class DefaultServerConfig implements ServerConfig {
+  otelEnabled(): boolean {
+    return Boolean(
+      this.otelEndpoint() && this.otelUsername() && this.otelPassword(),
+    );
+  }
+  otelEndpoint(): string {
+    return process.env.OTEL_ENDPOINT;
+  }
+  otelUsername(): string {
+    return process.env.OTEL_USERNAME;
+  }
+  otelPassword(): string {
+    return process.env.OTEL_PASSWORD;
+  }
   region(): string {
     if (this.env() == GameEnv.Dev) {
       return "dev";