fix(swamp): use synchronized map as container for nodes

[Wondertan]

While fixing #825, I discovered a race. We were not synchronizing writes to containers on the node. Additionally, I simplified storing of registered nodes by using map instead of per type slices. We don't use this per type separation anyhow

[codecov-commenter]

Codecov Report

Merging #2358 (7e48e12) into main (0823f6b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2358   +/-   ##
=======================================
  Coverage   50.86%   50.86%           
=======================================
  Files         154      154           
  Lines        9742     9742           
=======================================
  Hits         4955     4955           
  Misses       4353     4353           
  Partials      434      434           

see 2 files with indirect coverage changes

[distractedm1nd]

utACK, looks good and makes sense