Add blockchain.getDifficulty RPC

[izzycsy]

Add getDifficulty

What kind of PR is this?:

/kind feature
Add getDifficulty rpc

[codeclimate]

Code Climate has analyzed commit b2c497b 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	19.09 KB (+0.1% 🔺)	382 ms (+0.1% 🔺)	158 ms (-2.03% 🔽)	540 ms

[codecov]

Codecov Report

Merging #285 (b2c497b) into main (54b3e09) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #285      +/-   ##
==========================================
+ Coverage   96.38%   96.50%   +0.12%     
==========================================
  Files          82       85       +3     
  Lines        2155     2230      +75     
  Branches      275      287      +12     
==========================================
+ Hits         2077     2152      +75     
  Misses         78       78              

Impacted Files	Coverage Δ
...ages/jellyfish-api-core/src/category/blockchain.ts	100.00% <100.00%> (ø)
packages/jellyfish-api-core/src/category/mining.ts	100.00% <0.00%> (ø)
...ackages/jellyfish-transaction-builder/src/index.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_account.ts	100.00% <0.00%> (ø)
...jellyfish-transaction/src/script/defi/dftx_misc.ts	100.00% <0.00%> (ø)
...ransaction-builder/src/txn/txn_builder_liq_pool.ts	100.00% <0.00%> (ø)
...ckages/jellyfish-transaction/src/script/mapping.ts	95.23% <0.00%> (+0.23%)	⬆️
...ages/jellyfish-transaction/src/script/defi/dftx.ts	96.07% <0.00%> (+0.24%)	⬆️

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