Return token amounts as floats (bp #11370)

[mergify]

This is an automated backport of pull request #11370 done by Mergify

Cherry-pick of 86e3f96 has failed:

On branch mergify/bp/v1.2/pr-11370
Your branch is up to date with 'origin/v1.2'.

You are currently cherry-picking commit 86e3f96f1.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:

	modified:   account-decoder/src/parse_token.rs
	modified:   client/src/rpc_client.rs
	modified:   client/src/rpc_response.rs
	modified:   docs/src/apps/jsonrpc-api.md

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   core/src/rpc.rs

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[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #11378 into v1.2 will increase coverage by 0.0%.
The diff coverage is 85.3%.

@@          Coverage Diff           @@
##            v1.2   #11378   +/-   ##
======================================
  Coverage   82.2%    82.2%           
======================================
  Files        310      310           
  Lines      74514    74556   +42     
======================================
+ Hits       61288    61325   +37     
- Misses     13226    13231    +5