Feature/core 1276 identity runtime mnemonic

[Tschuck]

support runtime creation with mnemonic and identity password encryption salting

• split runtime creation from keyConfig parsing
• support identity salting for encryptionKey generation for createDefaultRuntime
• enhance tests for checking multiple types of mnemonics
• CORE-1276

[codecov-io]

Codecov Report

Merging #111 into develop will decrease coverage by 0.34%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #111      +/-   ##
===========================================
- Coverage    86.44%   86.09%   -0.35%     
===========================================
  Files           49       49              
  Lines         6240     6271      +31     
  Branches      1396     1405       +9     
===========================================
+ Hits          5394     5399       +5     
- Misses         843      869      +26     
  Partials         3        3              

Flag	Coverage Δ
#javascript	86.09% <100.00%> (-0.35%)	:arrow_down:

Impacted Files	Coverage Δ
src/onboarding.ts	93.39% <100.00%> (-0.45%)	:arrow_down:
src/runtime.ts	95.45% <100.00%> (+2.86%)	:arrow_up:
src/dfs/ipfs.ts	85.98% <0.00%> (-2.81%)	:arrow_down:
src/verifications/verifications.ts	89.38% <0.00%> (-2.55%)	:arrow_down:
src/mailbox.ts	89.09% <0.00%> (-1.82%)	:arrow_down:
src/dfs/ipld.ts	96.40% <0.00%> (-1.44%)	:arrow_down:
src/profile/profile.ts	72.84% <0.00%> (-0.96%)	:arrow_down:
src/payments.ts	68.16% <0.00%> (-0.90%)	:arrow_down:

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