MessageFormatTranspiler.transpile takes a lot of time

[k3nsei]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[x] Performance issue
[x] Feature request
[ ] Documentation issue or request
[ ] Support request
[ ] Other... Please describe:

Current behavior

MessageFormatTranspiler.transpile method takes a lot of time almost 3ms.

Expected behavior

Messages can be pre-transpiled when translations are set or loaded. Then generated closure can be memoized. To not parse them with every rerender.

Minimal reproduction of the problem with instructions

https://stackblitz.com/edit/transloco-example-izuqre?file=src/app/app.component.ts

What is the motivation / use case for changing the behavior?

Better performance

Environment

Angular version: 6.1.10


Browser:
- [x] Chrome (desktop) version 85
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: 10.22.0  
- Platform:  Mac 

Others:

[itayod]

Hi, I hope I could get to it soon as I am pretty busy these days...
In the mean time you are welcome to create a pr for it.

[k3nsei]

@itayod If I manage to find time, I will definitely try to improve it by myself.