Add mintTokens rpc

[jingyi2811]

What kind of PR is this?:

/kind feature

What this PR does / why we need it:

Add mintTokens rpc

Which issue(s) does this PR fixes?:

Fixes part of #48

Additional comments?:

[codeclimate]

Code Climate has analyzed commit b682ac7 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	19.63 KB (+0.14% 🔺)	393 ms (+0.14% 🔺)	153 ms (-5.42% 🔽)	545 ms

[codecov]

Codecov Report

Merging #290 (b682ac7) into main (9d311db) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #290   +/-   ##
=======================================
  Coverage   97.04%   97.05%           
=======================================
  Files          91       91           
  Lines        2507     2579   +72     
  Branches      318      328   +10     
=======================================
+ Hits         2433     2503   +70     
- Misses         74       76    +2     

Impacted Files	Coverage Δ
packages/jellyfish-api-core/src/category/token.ts	100.00% <100.00%> (ø)
...ainers/src/chains/reg_test_container/masternode.ts	94.44% <0.00%> (-3.71%)	⬇️
...jellyfish-transaction/src/script/defi/dftx_pool.ts	100.00% <0.00%> (ø)
...h-transaction-builder/src/txn/txn_builder_error.ts	100.00% <0.00%> (ø)
...transaction-builder/src/txn/txn_builder_oracles.ts	100.00% <0.00%> (ø)
...ellyfish-transaction/src/buffer/buffer_composer.ts	99.50% <0.00%> (+0.03%)	⬆️
...ages/jellyfish-transaction/src/script/defi/dftx.ts	97.43% <0.00%> (+0.13%)	⬆️
...ckages/jellyfish-transaction/src/script/mapping.ts	96.66% <0.00%> (+0.15%)	⬆️

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