[BUG] Sourcemap load errors in debugger from @nevware21 dependencies

[nev21]

Need to investigate the generated source map paths, to normalize them.

See https://github.com/microsoft/ApplicationInsights-JS/issues/2424

[nev21]

I suspect that the only reason that this was an issue is because the final consuming source map files (the end package that includes this package) was using external source map definitions rather than the internal included as part of this package.

So to support this scenario this required a few minor changes as both the actual generated build folder and the original src are explicitly not included in the npm package so that the resulting package size remains as small as possible (this is also the reason why the previously generated pre-bundled type where removed).

So the changes required consisted of

• Using the rollup sourcemaps plugin to correctly "include" the original .ts file rather than the generated .js (this needed to be fixed anyway)
• Rewrite the "sources" so that each individual file is now a direct reference back to this github repo for the tagged version (so that when releasing future versions these current releases won't point to the "new" code but the actual released code for that version).