Generalize the lib's binding API

[vcharpenay]

The code base to merge has a generic API for protocol bindings. See the entry point bindings.ProtocolBindings. Clients can initiate operations without knowledge of the underlying protocol (HTTP, CoAP or anything else), as suggested in #72.

HTTP and CoAP bindings have been updated accordingly. Other protocol bindings are available for OPC-UA and for ROS.

The README isn't up to date regarding e.g. TdHttpRequest. It should be updated before merging.

[codecov]

Codecov Report

Patch coverage: 61.62% and project coverage change: -2.07 ⚠️

Comparison is base (e48a1d4) 87.53% compared to head (ea17fda) 85.46%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #145      +/-   ##
============================================
- Coverage     87.53%   85.46%   -2.07%     
- Complexity      504      547      +43     
============================================
  Files            43       53      +10     
  Lines          1901     2071     +170     
  Branches        254      283      +29     
============================================
+ Hits           1664     1770     +106     
- Misses          161      220      +59     
- Partials         76       81       +5     

Impacted Files	Coverage Δ
...nisg/ics/interactions/wot/td/affordances/Link.java	0.00% <0.00%> (ø)
...wot/td/bindings/BindingNotRegisteredException.java	0.00% <0.00%> (ø)
...ractions/wot/td/bindings/InvalidFormException.java	0.00% <0.00%> (ø)
...s/interactions/wot/td/security/SecurityScheme.java	100.00% <ø> (ø)
...ions/wot/td/security/TokenBasedSecurityScheme.java	100.00% <ø> (ø)
...unisg/ics/interactions/wot/td/vocabularies/TD.java	0.00% <ø> (ø)
...eractions/wot/td/bindings/coap/TDCoapResponse.java	66.66% <20.00%> (ø)
...ractions/wot/td/bindings/coap/TDCoapOperation.java	40.00% <40.00%> (ø)
...ractions/wot/td/bindings/http/TDHttpOperation.java	48.27% <48.27%> (ø)
...eractions/wot/td/bindings/NoResponseException.java	50.00% <50.00%> (ø)
... and 12 more

... and 2 files with indirect coverage changes

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[danaivach]

Hi @vcharpenay, I have this PR in mind to be looked this week (also see how to increase coverage to target).

Would you consider the branch stable enough to be merged with main?

[vcharpenay]

We've used this version of the lib in the ai4industry summer school last week. I also used it in another project. The binding API has been quite stable since then, and we haven't found bugs in the HTTP binding so far. I haven't tried to integrate the CoAP binding, though. I don't have a test bed for that.

[danaivach]

@vcharpenay is the README up to date?