[Internal] 3.49.0: Adds Version bump, changelog, and contracts#5140

microsoft-github-policy-service[bot] merged 4 commits intomasterAzure/azure-cosmos-dotnet-v3:masterfrom

users/nalutripician/3.49.0-changelogVersionBumpAzure/azure-cosmos-dotnet-v3:users/nalutripician/3.49.0-changelogVersionBumpCopy head branch name to clipboard