e2e: test different types of outputs for feature 'Ecxecute method'

[dennis00010011b]

Relates #219
Added e2e tests:

Execute Method screen
       Check UI and button's functionality
         ✓ Click button 'Send', 'Execute Method' screen opens (3200ms)
         ✓ title is displayed and correct (141ms)
         ✓ Click arrow  button leads to main screen (271ms)
         ✓ Click button 'Send', 'Execute Method' screen opens (3347ms)
       Check output for data type : ADDRESS
         ✓ Select method 'returnAddress' (1344ms)
         ✓ Button 'Call data' is displayed and disabled (142ms)
         ✓ Fill out input field 'Address' (419ms)
         ✓ Button 'Call data' is displayed and enabled (396ms)
         ✓ method returns correct value (3256ms)
         ✓ 2nd call doesn't throw the error (616ms)
       Check output for data type : STRING
         ✓ Select method 'returnString' (4348ms)
         ✓ Fill out input parameter field  (253ms)
         ✓ Click button 'Call data'  (382ms)
         ✓ method returns correct value (3254ms)
       Check output for data type : BOOLEAN
         ✓ Select method 'returnBoolean' (1225ms)
         ✓ Fill out input parameter field, value is TRUE (259ms)
         ✓ Click button 'Call data'  (384ms)
         ✓ method returns correct value: TRUE (3261ms)
         ✓ Fill out input parameter field, value is FALSE  (502ms)
         ✓ Click button 'Call data'  (369ms)
         ✓ method returns correct value, FALSE (3306ms)
       Check output for data type : BYTES
         ✓ Select method 'returnBytes1' (1286ms)
         ✓ Fill out input parameter field  (210ms)
         ✓ Click button 'Call data'  (378ms)
         ✓ method returns correct value (3399ms)
       Check output for data type : UINT256
         ✓ Select method 'returnUint256' (1262ms)
         ✓ Fill out input parameter field  (347ms)
         ✓ Click button 'Call data'  (400ms)
         ✓ method returns correct value (3249ms)
       Check output for data type : INT256
         ✓ Select method 'returnInt256' (1217ms)
         ✓ Fill out input parameter field  (436ms)
         ✓ Click button 'Call data'  (382ms)
         ✓ method returns correct value (3251ms)
       Check executed method
         ✓ Select method 'transfer' (1237ms)
         ✓ Button 'Copy ABI encoded' is displayed (133ms)
         ✓ Button 'Copy ABI encoded' is disabled (140ms)
         ✓ Button 'Next' is disabled (138ms)
         ✓ Fill out parameter '_value' with valid data (148ms)
         ✓ Button 'Copy ABI encoded' is disabled (139ms)
         ✓ Button 'Next' is disabled (214ms)
         ✓ Fill out parameter '_to'  with wrong data (398ms)
         ✓ Error message if click 'Copy ABI encoded' with wrong address (502ms)
         ✓ Close error message (486ms)
         - Error message if click 'Next' with wrong address
         - Close error message
         ✓ Fill out parameter '_to' with valid data (1152ms)
         ✓ Button 'Next' is enabled (135ms)
         ✓ Button 'Copy ABI encoded' is enabled (387ms)
         ✓ Click button 'Next' (402ms)
     Choose Contract Executor
       ✓ title is displayed and correct (5201ms)
       ✓ two accounts displayed (141ms)
       ✓ Click arrow  button leads to 'Execute Method' screen  (2566ms)
       ✓ Return back to 'Choose Contract Executor' screen (406ms)
       ✓ Button 'Next' is disabled by default (138ms)
       ✓ User is able to select account (371ms)
       ✓ User is able to select only one account (239ms)
       ✓ Click button 'Next' open 'Confirm transaction' screen (5718ms)
       ✓ Label 'CONTRACT' present (521ms)
       ✓ Delete imported account (1287ms)