migrate asset-registry benchmark

[zjb0807]

#2766

[zjb0807]

• /bench runtime mandala *

[zjb0807]

The new benchmark requires importing the associated module as a dependency, which I’m not sure is what we want.

Acala/runtime/mandala/src/benchmarking/dex_oracle.rs

Lines 51 to 52 in a6bb42c

	set_block_number_timestamp(1, 24000);
	DexOracle::on_initialize(1)

the dex-oracle need to import the module-currencies, module-dex, pallet-aura, pallet-balances, pallet-timestamp, sp-consensus-aura, it feels too bulky

[xlc]

can we mock it?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 65.30%. Comparing base (a6bb42c) to head (6baf951).

Files	Patch %	Lines
modules/asset-registry/src/benchmarks.rs	0.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2767      +/-   ##
==========================================
- Coverage   65.49%   65.30%   -0.20%     
==========================================
  Files          69       69              
  Lines        9885     9522     -363     
==========================================
- Hits         6474     6218     -256     
+ Misses       3411     3304     -107     

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