CosmosDiagnostics: Removes ITrace Caller Info and makes the Dictionary for Data lazy

[asketagarwal]

1. The Trace library always creates a CallerInfo object. This adds overhead to both collecting the trace and the CosmosDiagnostic.ToString() logic. There has been no use case for this information so it should be removed until there is a scenario.

2. IReadOnlyDictionary should be created lazily. In most traces no data is being added. A static singleton could be used by default.

The object removed:

"caller info": {
                "member": "OperationHelperWithRootTraceAsync",
                "file": "/home/askagarw/azure-cosmos-dotnet-v3/Microsoft.Azure.Cosmos/src/Resource/ClientContextCore.cs",
                "line": 244
            }

Closing issues

To automatically close an issue: closes #2972

[sourabh1007]

Can you please put callerInfo sample in the PR description? What information it use to have?