Added wson8 packages and devices

[eto-]

SUMMARY

• Added wson8 2x2 mm and 3x3 mm packages.
• Added opamp with compensation components.
• Added devices
  • LMH6629
  • OPA858

DATASHEETS / REFERENCES

https://www.ti.com/product/OPA858
https://www.ti.com/product/LMH6629

OPEN QUESTIONS / UNRESOLVED ISSUES

• WSON8 package is specific to TI
• On could argue if the opamp with compensation components has to go to a generic library, but I'm not aware of other devices of other brand with this configuration.

CHECKLIST

• [x ] I have read and followed the library conventions¹.
• For packages, I followed IPC7351C (see details in library conventions).
• For modified elements, I bumped their version number².
• [x ] I already used the new library elements in a design and verified their correctness (optional).
• [x ] I'm the copyright owner of the added content (i.e. the changes are made by myself, not copied/imported from somewhere else).
• [x ] I agree to publish all my changes under the CC0 Public Domain License³, allowing everyone to use and modify the content without any restrictions.

¹ Library Conventions: https://docs.librepcb.org/#libraryconventions
² Minor version bump if only metadata was modified (e.g. "0.1" -> "0.1.1"), major version bump if functional changes were made (e.g. "0.1" -> "0.2")
³ CC0 Public Domain License: https://en.wikipedia.org/wiki/CC0