[MC-2359] Add normalized event and property names evaluation

[nishant-clevertap]

• Adds method areEqualNormalizedName: to check if two strings are normalized equal or not.
• Adds method getNormalizedName: to get normalized name after removing white spaces and converting it to lowercase with en_US locale.
• Added normalisation to event name and event property name.
• Added unit tests.

[nzagorchev]

@nishant-clevertap Implementation looks good to me. Please add a comment on why this is done and why we use the English locale, see the android PR for details.

[nishant-clevertap]

@nishant-clevertap Implementation looks good to me. Please add a comment on why this is done and why we use the English locale, see the android PR for details.

Added method docs and comment.

[nzagorchev]

We need to define the behavior if multiple properties equal the normalized property name, for example:

NSArray *whenTriggers = @[
    @{
        @"eventName": @"event1",
        @"eventProperties": @[
            @{
                @"propertyName": @"prop1",
                @"operator": @1,
                @"propertyValue": @"test"
            }
        ]
    }
];

match = [triggerMatcher matchEventWhenTriggers:whenTriggers eventName:@"event1" eventProperties:@{
    @"Prop  1": @"test1",
    @"Prop1": @"test",
    @"prop1": @"test2"
}];

We also need a test for the items keys normalization.