Allows disabling timeout from the client

[TMSCH]

• Refactored timeout handling for Requests to be able to set them at the dispatch time.
• Added an enableTimeouts method on the openyolo instance to enable/disable globally timeouts.
• Removed timeout from the SecureChannel on the provider side.
• Wrote tests to cover api.ts

[codecov-io]

Codecov Report

Merging #21 into master will increase coverage by 8.1%. The diff coverage is 90%.

@@            Coverage Diff            @@
##           master      #21     +/-   ##
=========================================
+ Coverage   78.64%   86.75%   +8.1%     
=========================================
  Files          34       32      -2     
  Lines        1241     1253     +12     
  Branches      134      155     +21     
=========================================
+ Hits          976     1087    +111     
+ Misses        225      166     -59     
+ Partials       40        0     -40

Impacted Files	Coverage Δ
ts/api/wrap_browser_request.ts	33.33% <0%> (-4.17%)	:arrow_down:
ts/api/proxy_login.ts	100% <100%> (ø)	:arrow_up:
ts/api/credential_save.ts	100% <100%> (ø)	:arrow_up:
ts/api/base_request.ts	98.52% <100%> (+2.45%)	:arrow_up:
ts/api/credential_request.ts	100% <100%> (ø)	:arrow_up:
ts/api/hint_available_request.ts	100% <100%> (+6.25%)	:arrow_up:
ts/api/hint_request.ts	100% <100%> (ø)	:arrow_up:
ts/protocol/secure_channel.ts	91.91% <100%> (+3.36%)	:arrow_up:
ts/spi/provider_frame.ts	83.63% <100%> (+5.52%)	:arrow_up:
ts/api/api.ts	77.19% <87.93%> (+49.45%)	:arrow_up:
... and 34 more

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[TMSCH]

Thanks @iainmcgin!