Trading Pair Min volume

[nakul1010]

The Pr fixes following things

• it doesn't allow a user to register pair which has volume less than min volume.
• Min Volume = Min price * Min qty.
• The min price, min qty, min volume a pair can be register is with 10000.

[codecov[bot]]

Codecov Report

Base: 80.62% // Head: 80.69% // Increases project coverage by +0.06% :tada:

Coverage data is based on head (7775f4c) compared to base (1a00364). Patch coverage: 97.72% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           Develop     #524      +/-   ##
===========================================
+ Coverage    80.62%   80.69%   +0.06%     
===========================================
  Files           27       28       +1     
  Lines         2860     2948      +88     
===========================================
+ Hits          2306     2379      +73     
- Misses         554      569      +15     

Impacted Files	Coverage Δ
pallets/ocex/src/lib.rs	82.13% <87.50%> (+0.11%)	:arrow_up:
pallets/ocex/src/tests.rs	98.83% <100.00%> (+0.26%)	:arrow_up:
node/src/rpc.rs	0.00% <0.00%> (ø)
runtime/src/lib.rs	0.00% <0.00%> (ø)
pallets/asset-handler/src/tests.rs	100.00% <0.00%> (ø)
pallets/asset-handler/rpc/src/lib.rs	0.00% <0.00%> (ø)
pallets/asset-handler/src/lib.rs	80.71% <0.00%> (+0.56%)	:arrow_up:

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