runtime: convert services to standard object

[samouri]

summary

More palatable alternative to #36400. Addresses part of #35264 (comment), and #36453
Converts Services to a regular object instead of a class with static methods.
This allows terser to DCE unused Services, whereas Closure Compiler seems to lose the ability.

before

class Services {
  ampdocFor() {...}
  bindForDocOrNull() {...}
}

after

const Services =  {
  ampdocFor: () => {...},
  bindForDocOrNull: () => {...}
}

results

	v0.mjs brotli	v0.mjs
closure compiler on main	60.87	212.31
closure compiler on this branch	60.91	212.76
esbuild on this branch	61.76	223.99
esbuild on main	62.50	229.95

[samouri]

First issue found: terser will not dce an object if that object has any self-references (which Services does)

[samouri]

Second issue, it also doesn't like shorthand syntax for when names match
EDIT opened up a terser FR to address both issues: terser/terser#1097.

For now we have workarounds (no self-references or obj shorthand)