feat: admin v1 new rpc support #685 - WIP

[zamnuts]

Should merge #686 first to pick up proto changes.

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

Fixes #685 🦕

Feature completeness status (incl. implementation, tests, samples, sample tests, docs):

• ImportEntities
• ExportEntities
• GetIndex
• ListIndexes

[codecov]

Codecov Report

Merging #687 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #687      +/-   ##
==========================================
+ Coverage   98.85%   98.87%   +0.02%     
==========================================
  Files          10       10              
  Lines        7243     7402     +159     
  Branches      438      453      +15     
==========================================
+ Hits         7160     7319     +159     
  Misses         81       81              
  Partials        2        2              

Impacted Files	Coverage Δ
src/index.ts	99.74% <100.00%> (+0.04%)	⬆️
src/request.ts	100.00% <100.00%> (ø)

---

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 25d6582...b81154d. Read the comment docs.

[stephenplusplus]

This work has continued in #734.