refactor: package publishing building blocks

[sajayantony]

This is a draft PR to enable publishing a nuget package once we agree on the home for the package. If we are publishing to nuget we should potentially create an organization and setup a github workflow to publish the packages on tag push.

This PR Involves the following changes.

1. Move source to ./src and test to ./test . e.g. Pattern from https://github.com/dotnet/aspnetcore/tree/main/src/Components/Authorization
2. Added make file to create a dotnet nupkg.
3. Nugkg version determined based on git tag otherwise use a default dev tag 0.0.0-dev

Need to merge PR #33 before merging this as there are file moves involved here.

[Wwwsylvia]

Wondering if we should use this structure? https://learn.microsoft.com/en-us/dotnet/core/porting/project-structure

[sajayantony]

@Wwwsylvia - updated with the new structure and tested the
make build pack
Generates the package with git tag given by git describe --tags

[Wwwsylvia]

LGTM