Add removeOracle rpc

[jingyi2811]

What kind of PR is this?:

/kind feature

What this PR does / why we need it:

Add removeOracle rpc

Which issue(s) does this PR fixes?:

Fixes part of #202

Additional comments?:

[codeclimate]

Code Climate has analyzed commit 3c7ff99 and detected 0 issues on this pull request.

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[netlify]

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
packages/jellyfish/dist/jellyfish.umd.js	19.92 KB (+0.1% 🔺)	399 ms (+0.1% 🔺)	168 ms (-0.11% 🔽)	567 ms

[codecov]

Codecov Report

Merging #339 (6001a65) into main (9e6f5d5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 6001a65 differs from pull request most recent head 3c7ff99. Consider uploading reports for the commit 3c7ff99 to get more accurate results

@@           Coverage Diff           @@
##             main     #339   +/-   ##
=======================================
  Coverage   97.07%   97.07%           
=======================================
  Files          93       93           
  Lines        2600     2602    +2     
  Branches      331      332    +1     
=======================================
+ Hits         2524     2526    +2     
  Misses         76       76           

Impacted Files	Coverage Δ
packages/jellyfish-api-core/src/category/oracle.ts	100.00% <100.00%> (ø)

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