* Add and Improve type guards for `is` methods
The following methods were update to include type-guards and improve the generics over when using the type-guards:
* isNode
* isRelationship
* isUnboundRelationship
* isPath
* isPathSegment
* isPoint
* isDuration
* isLocalTime
* isTime
* isDate
* isLocalDateTime
* isDateTime
Usage example without generics:
```
function handleDuration(duration: unknown) {
   if (isDuration(duration)) {
      // from this point i can access the duration properties
      // and methods without issue
      const months: Integer = duration.months
   } else {
      // this is not a duration object
      // @ts-expect-error
      const months = duration.months
   }
}
```
Usage example with generics:
The following methods were update to include type-guards and improve the generics over when using the type-guards:
* isNode
* isRelationship
* isUnboundRelationship
* isPath
* isPathSegment
* isPoint
* isDuration
* isLocalTime
* isTime
* isDate
* isLocalDateTime
* isDateTime
Usage example without generics:
```typescript
function handleDuration(duration: unknown) {
   if (isDuration(duration)) {
      // from this point i can access the duration properties
      // and methods without issue
      const months: Integer = duration.months
   } else {
      // this is not a duration object
      // @ts-expect-error
      const months = duration.months
   }
}
```
Usage example with generics:
```typescript
function handleDuration(duration: unknown) {
   if (isDuration<number>(duration)) {
      // from this point i can access the duration properties
      // and methods without issue
      const months: number = duration.months
      // @ts-expect-error
      const intMonths: Integer = duration.months
   } else {
      // this is not a duration object
      // @ts-expect-error
      const months = duration.months
   }
}
```
⚠️ Generic types miss-match in runtime will not trigger errors.
Co-authored-by: Robsdedude <dev@rouvenbauer.de>