Update xtoken reserve provider

[zjb0807]

• add XtokensParameters to store ReserveLocation with orml_parameters pallet
• add ParametersMigrateToV1 to setup ReserveLocation of XtokensParameters

Since the chain_part and non_chain_part called by xtokens are hard-coded, if we want to use xtokens after AHM, we need to upgrade the runtime first.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.06%. Comparing base (069ed19) to head (487d124).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2915      +/-   ##
==========================================
- Coverage   61.12%   61.06%   -0.07%     
==========================================
  Files          69       70       +1     
  Lines        9449     9554     +105     
==========================================
+ Hits         5776     5834      +58     
- Misses       3673     3720      +47     

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[zjb0807]

It seems that adding MigratedStatus storage to xtokens to control it would be better. No runtime upgrade