RPC for querying prices for all assets of given pool_id.

[vivekvpandya]

Fixes #804

[maltekliemann]

In addition to the comments made in the code, could you please ensure that the copyright notices are updated.

[codecov-commenter]

Codecov Report

Merging #971 (5e67edd) into main (1f7ea61) will increase coverage by 0.00%.
The diff coverage is 90.47%.

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@@           Coverage Diff           @@
##             main     #971   +/-   ##
=======================================
  Coverage   94.39%   94.39%           
=======================================
  Files          93       93           
  Lines       21060    21138   +78     
=======================================
+ Hits        19880    19954   +74     
- Misses       1180     1184    +4     

Flag	Coverage Δ
tests	94.39% <90.47%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
zrml/prediction-markets/src/mock.rs	78.83% <ø> (-0.16%)	⬇️
zrml/swaps/src/mock.rs	27.41% <0.00%> (-3.49%)	⬇️
zrml/swaps/src/tests.rs	99.93% <98.38%> (-0.04%)	⬇️
zrml/swaps/src/lib.rs	95.80% <100.00%> (+0.04%)	⬆️

... and 5 files with indirect coverage changes

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[sea212]

Tested using curl.

• Works using single and multiple blocks
• Provides correct results
• Handles errors properly