Add CHANGELOG for 2.48.0

[dchakarwarti]

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[dchakarwarti]

/retest

[google-oss-prow]

@dchakarwarti: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ESPv2-anthos-cloud-run-e2e-anthos-cloud-run-http-bookstore	64bfec0	link	true	/test ESPv2-anthos-cloud-run-e2e-anthos-cloud-run-http-bookstore
ESPv2-gke-e2e-http-bookstore-managed	64bfec0	link	true	/test ESPv2-gke-e2e-http-bookstore-managed
ESPv2-gke-e2e-grpc-echo-managed	64bfec0	link	true	/test ESPv2-gke-e2e-grpc-echo-managed
ESPv2-gke-e2e-grpc-interop-managed	64bfec0	link	true	/test ESPv2-gke-e2e-grpc-interop-managed
ESPv2-gke-e2e-http-bookstore-managed-using-sa-cred	64bfec0	link	true	/test ESPv2-gke-e2e-http-bookstore-managed-using-sa-cred
ESPv2-cloud-run-e2e-app-engine-http-bookstore	64bfec0	link	true	/test ESPv2-cloud-run-e2e-app-engine-http-bookstore
ESPv2-presubmit	64bfec0	link	true	/test ESPv2-presubmit
ESPv2-presubmit-asan	64bfec0	link	true	/test ESPv2-presubmit-asan

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dchakarwarti, shuoyang2016, TAOXUY

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