feat: Change xcall btp service name to xcallM

[AntonAndell]

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version: <log entry>

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• I have performed a self-review of my own code
• I have documented my code in accordance with the documentation guidelines
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[codecov]

Codecov Report

Merging #152 (ca912a9) into main (6779754) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #152   +/-   ##
=========================================
  Coverage     68.00%   68.00%           
  Complexity       54       54           
=========================================
  Files            32       32           
  Lines          1919     1919           
  Branches         33       33           
=========================================
  Hits           1305     1305           
  Misses          598      598           
  Partials         16       16           

Flag	Coverage Δ
java	81.40% <ø> (ø)
solidity	62.63% <ø> (ø)

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[ibrizsabin]

looks good.