Fix S2674 FN: Add support for ConfigureAwait

[martin-strecker-sonarsource]

Description

S2674 does not take ConfigureAwait into account.

Repro steps

  await stream.ReadAsync(array, 0, (int)stream.Length);                       // Raises S2674
  await stream.ReadAsync(array, 0, (int)stream.Length).ConfigureAwait(false); // Does not

Expected behavior

Raise S2674 if ReadAsync is configured to continue on the current synchronization context.

Actual behavior

Does not raise.

Known workarounds

No