news: add entries for #276

Signed-off-by: Attila Szakacs <[email protected]>

news/feature-276-1.md

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+`opentelemetry()`, `axosyslog-otlp()`, `syslog-ng-otlp()`: Added `keep-alive()` options.
+
+Keepalive can be configured with the `time()`, `timeout()`
+and `max-pings-without-data()` options of the `keep-alive()` block.
+
+```
+opentelemetry(
+    ...
+    keep-alive(time(20000) timeout(10000) max-pings-without-data(0))
+);
+```

news/feature-276-2.md

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+`bigquery()`: Added `auth()` options.
+
+Similarly to other gRPC based destination drivers, the `bigquery()`
+destination now accepts different authentication methods, like
+`adc()`, `alts()`, `insecure()` and `tls()`.
+
+```
+bigquery (
+    ...
+    auth(
+        tls(
+            ca-file("/path/to/ca.pem")
+            key-file("/path/to/key.pem")
+            cert-file("/path/to/cert.pem")
+        )
+    )
+);
+```

news/feature-276-3.md

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+`loki()`: Added `batch-bytes()` and `compression()` options.