Typescript incremental build

[dazinator]

When the typescript pipeline processes typescript files, it currently sends them all to nodejs, even if only one file was changed.

The change, will be to only send the files accross that have changed since the last build.

This will result in performance and efficiency improvements.

For example, when the pipeline has foo.ts and bar.ts as inputs - the first time the pipeline processes the files, both files will be sent accross to NodeJs for the typescript compiler to process. However if you then save some changes to foo.ts - the pipeline will only send the modified contents of foo.ts over to nodejs, as well as just the name of the other files (bar.ts). On the nodejs side, it will store the file contents from previous runs, so it doesn't need them to be re-sent over the wire - it only needs to latest modified file content to be sent.