add translation and rotation to fiber agents

[toloudis]

Problem

332

Up until now, fibers have been required to put their subpoints into fully transformed world space, and position and rotation required to be 0. However, our updated fiber rendering does now support full transformations.

Solution

Add a code path to actually use agent position and rotation to transform fiber vertices. Also add a simple javascript test simulator to demonstrate translation and rotation.

Type of change

• New feature (non-breaking change which adds functionality)

Change summary:

Add transformation to the shader. Add code path to send data in. This required adding a whole new buffer for the rotation data. This could be inefficient if rotations are nearly always 0 - we are just passing around a buffer of 0s and doing a little extra math with them.

Steps to Verify:

Can clone and select the "TEST_SINGLE_FIBER" in the demo viewer.

Screenshots (optional):

https://github.com/simularium/simularium-viewer/assets/2193409/3eae4d6d-529f-4dd6-8f80-fb4f3adbe993

[github-actions[bot]]

jest coverage report 🧪

Total coverage

Status	Category	Percentage	Covered / Total
🔴	Statements	40.12%	1962/4890
🔴	Branches	43.82%	819/1869
🔴	Functions	37.22%	405/1088
🔴	Lines	40.37%	1879/4654

Status of coverage: 🟢 - ok, 🟡 - slightly more than threshold, 🔴 - under the threshold

Show files with reduced coverage 🔻

### Reduced coverage | Status | Filename | Statements | Branches | Functions | Lines | | :----: | :------------------------ | :--------- | :------- | :-------- | :------ | | 🔴 | src/visGeometry | 19.88% | 21.73% | 25.19% | 19.89% | | 🔴 | VisAgent.ts | 33.33% | 39.47% | 22.22% | 33.75% | | 🔴 | src/visGeometry/rendering | 41.04% | 65.27% | 32.23% | 41.56% | > Status of coverage: 🟢 - ok, 🟡 - slightly more than threshold, 🔴 - under the threshold

[ascibisz]

The shader part is a bit over my head (although based on context clues it looks reasonable), so looks good to me!