Introduce ApiComponent as proxy for BEditaClient

[batopa]

This PR is a proposal to try to make more easy to handle errors thrown by BEditaClient.

The Component is a proxy to BEditaClient and should be setup in Controller::initialize() method

$this->loadComponent('BEdita/WebTools.Api', [
    'apiClient' => ApiClientProvider::getApiClient(),
    'exceptionsEnabled` => true // default to true
]);

In this way the component throws exceptions as BEditaClient usually do.

In the Controller action we can use the component transparently as if we were using a BEditaClient instance

$response = $this->Api->getObject('gustavo'); // if gustavo not exists a BEditaClientException will be thrown

If we don't want to throw exception but handle the error we can do

$response = $this->Api
    ->enableExceptions(false)
    ->getObject('gustavo');

if ($this->Api->hasError()) {
    $this->Flash->error($this->Api->getError());
}

When the exceptions are disabled the last error is stored in ApiComponent and reset at every request delegated to BEditaClient

[codecov-commenter]

Codecov Report

Merging #21 into master will increase coverage by 0.91%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #21      +/-   ##
============================================
+ Coverage     85.53%   86.45%   +0.91%     
- Complexity      132      141       +9     
============================================
  Files            16       17       +1     
  Lines           325      347      +22     
============================================
+ Hits            278      300      +22     
  Misses           47       47              

Impacted Files	Coverage Δ	Complexity Δ
src/Controller/Component/ApiComponent.php	100.00% <100.00%> (ø)	9.00 <9.00> (?)

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