feat!: converts library to TypeScript adding v1p1beta1 surface

[bcoe]

converts library to TypeScript, so that we can generate v1p1beta1 which uses the new type annotations.

Currently there are the following generation issues that need to be addressed:

• unit tests fail for all but `v1p1beta1.
• v1beta1 API surface does not generate.

[alexander-fenster]

I will take a look, thank you!

[alexander-fenster]

@bcoe Unfortunately, asset API versions other than v1p1beta1 are still not ready for micro-generators (including TypeScript). Including @noahdietz here for details on this API conversion.

If you'd like to, we can combine TypeScript v1p1beta1 with JavaScript (generated by old gapic generator) into one library (manually, as we did for translate some time ago), but I'd rather not do it until we have an ETA about this API complete conversion.

[noahdietz]

This API version was added on Jan 06, 2020 and I didn't know, so I will need to annotate and publish. It will be done this week, I'll try to get it done sooner rather than later.

[noahdietz]

Asset v1p1beta1 was annotated and published here googleapis/googleapis@26ccb21.

[codecov]

Codecov Report

Merging #250 into master will increase coverage by 55.53%.
The diff coverage is 90.45%.

@@             Coverage Diff             @@
##           master     #250       +/-   ##
===========================================
+ Coverage   35.35%   90.89%   +55.53%     
===========================================
  Files          39        9       -30     
  Lines        6624     3392     -3232     
  Branches        0      151      +151     
===========================================
+ Hits         2342     3083      +741     
+ Misses       4282      305     -3977     
- Partials        0        4        +4

Impacted Files	Coverage Δ
src/index.ts	100% <100%> (ø)
src/v1beta1/index.ts	100% <100%> (ø)
src/v1p2beta1/index.ts	100% <100%> (ø)
src/v1p1beta1/index.ts	100% <100%> (ø)
src/v1/index.ts	100% <100%> (ø)
src/v1beta1/asset_service_client.ts	90.44% <87.25%> (ø)
src/v1p2beta1/asset_service_client.ts	87.38% <87.38%> (ø)
src/v1/asset_service_client.ts	91.35% <91.35%> (ø)
src/v1p1beta1/asset_service_client.ts	92.62% <92.62%> (ø)
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 18feb68...cf3b9f1. Read the comment docs.

[alexander-fenster]

The list of path templates is different (if you compare it with the deleted src/v1/asset_service_client.js). Let me double check if the new path templates are correct in the annotations. For now, please mark this PR as feat! because it now has breaking changes.

[alexander-fenster]

This will be a breaking change to Webpack users. If we're breaking it anyway (which is what is likely to happen), let's keep this. If we want to be compatible, we'll need --main-service-name asset as an extra generator arg. But I'd better break it since there are no active Webpack users here as I'm pretty sure :)