Adding a 'watch' mode to most projects

[mcottontensor]

Relevant components:

• Signalling server
• Common library
• Frontend library
• Frontend UI library
• Matchmaker
• Platform scripts
• SFU

Problem statement:

#332
The build process is finicky and error prone with knowing what to build and when. Some build scripts are even broken in some situations. We want to automate or semi-automate the build process so that development is more streamlined.

Solution

After much fussing about with mono repo tools and webpack etc. I found that using a series of nodemon scripts along with tsc watch mode and webpack was the simplest solution.
There is now a single script called develop in the signalling server project that will go though all the components and kick off a watch process that will not only watch for source changes but also dependency changes and auto build and when needed restart the signalling server.
This should allow you to start the develop script and then make changes to whatever component you need, including frontend changes, and have them working and served immediately.

Documentation

Updated SS launch docs mentioning npm run develop

Test Plan and Compatibility

See above.

[lukehb]

Some comments about what I believe to be load bearing configuration of how ESM modules were being built.

Additionally, we should land docs changes for how to use watch in this PR too.

Besides that, PR and approach looks good!

[mcottontensor]

💚 All backports created successfully

Status	Branch	Result
✅	UE5.5

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