vscode-trace-extension not working with latest trace-viewer depenencies

[bhufmann]

With the recent updates in the trace viewer components and its dependencies to use BigInt for timestamps, the serialization of messages between the webviews and vscode extension will fail because the standard json serializer doesn't support type BigInt.

It will fail with the following message:

TypeError: Do not know how to serialize a BigInt
/usr/share/code/resources/app/out/bootstrap-fork.js:5
stack trace: TypeError: Do not know how to serialize a BigInt
	at JSON.stringify (<anonymous>)
	at y (/usr/share/code/resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:89:3480)
	at g.postMessage (/usr/share/code/resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:96:73489)
	at TraceViewerPanel.setExperiment (/home/eedbhu/git/vscode-trace-extension/vscode-trace-extension/lib/trace-viewer-panel/trace-viewer-webview-panel.js:125:29)
	at /home/eedbhu/git/vscode-trace-extension/vscode-trace-extension/lib/trace-explorer/trace-tree.js:123:19
	at processTicksAndRejections (internal/process/task_queues.js:93:5)

For example the Experiment or Trace classes contain timestamp fields which are BigInt and causing serialization problems and the vscode trace extension to fail.

To fix this, each message send between webviews and the vscode trace extension itself need to be updated that BigInt values are serialized properly (e.g. using a string) and deserialized to BigInt on the receiving side.

This issue needs to be fixed before upgrading to the latest traceviewer components which contain many valuable improvements.

[bhufmann]

Using eclipse-cdt-cloud/tsp-typescript-client#56, the serialization / deserialization of BigInt values can be achieved when sending/receiving signals.

[bhufmann]

The extension works now with:

• traceviewer-base: 0.2.0-next.7298b48.0
• traceviewer-react-components: "0.2.0-next.7298b48.0"

Serialization is fixed for experiments and it's not an issue for data provider descriptors. Closing this one and open a ticker for improved and more generic serialization implementation.