chore: include major version in the API global symbol

This will prevent any chance of a version X API interfering with a
version Y API if X and Y are different major versions.

src/internal/global-utils.ts

@@ -23,7 +23,10 @@ import type { TracerProvider } from '../trace/tracer_provider';
 import { VERSION } from '../version';
 import { isCompatible } from './semver';
 
-const GLOBAL_OPENTELEMETRY_API_KEY = Symbol.for('io.opentelemetry.js.api');
+const major = VERSION.split('.')[0];
+const GLOBAL_OPENTELEMETRY_API_KEY = Symbol.for(
+  `io.opentelemetry.js.api.${major}`
+);
 
 const _global = _globalThis as OTelGlobal;
 

test/internal/global.test.ts

@@ -43,7 +43,7 @@ describe('Global Utils', () => {
     api1.trace.disable();
     api1.diag.disable();
     // @ts-expect-error we are modifying internals for testing purposes here
-    delete _globalThis[Symbol.for('io.opentelemetry.js.api')];
+    delete _globalThis[Symbol.for('io.opentelemetry.js.api.0')];
   });
 
   it('should change the global context manager', () => {
@@ -82,7 +82,7 @@ describe('Global Utils', () => {
     const globalInstance = getGlobal('context');
     assert.ok(globalInstance);
     // @ts-expect-error we are modifying internals for testing purposes here
-    _globalThis[Symbol.for('io.opentelemetry.js.api')].version = '0.0.1';
+    _globalThis[Symbol.for('io.opentelemetry.js.api.0')].version = '0.0.1';
 
     assert.strictEqual(api1.context['_getContextManager'](), original);
   });