Function isFreetextQualifier

isFreetextQualifier(
qualifier: unknown,
): qualifier is Readonly<{ freetext: string }>
Returns true if the given qualifier is a FreetextQualifier otherwise false.

The condition for being a valid freetext is that the qualifier should have a freetext key and the value should be a string which is more than 3 characters in length. The additional condition is that the value should not contain a whitespace(' ') unless the value is in the key:value pattern.
Parameters
- qualifier: unknown
  the qualifier to check
Returns qualifier is Readonly<{ freetext: string }>
true if the given type is a FreetextQualifier, otherwise false.
Example
```
// valid
{ freetext: 'abc' }
// valid
{ freetext: 'key:value with spaces' }
```
Example
```
// invalid
{ freetext: 'value with spaces' }
```
- Defined in shared-libs/cht-datasource/src/qualifier.ts:100