Add Items and Custom to FieldSchema

[bossinc]

Description

Please describe what does this Pull Request fix or add?.
Adding Items and Custom to FieldSchema so they can be used to determine the data type of a Jira field.

Information that is useful here:

• The What: Adding Items and Custom to FieldSchema
• The Why: For example, the Type can be array and the Items can be string or some other type. It is useful to have that information if the user wants to get more information about the data type
• Type of change: New feature
• Breaking change: No
• Related to an issue: Does this fix or close an issue? Or is related in any kind?
• Jira Version + Type: Cloud

Example:

Let us know how users can use or test this functionality.

// Example code

Checklist

• Unit or Integration tests added
  • Good Path
  • Error Path
• Commits follow conventions described here:
  • Conventional Commits 1.0.0
  • The seven rules of a great Git commit message
• Commits are squashed such that
  • There is 1 commit per isolated change
• I've not made extraneous commits/changes that are unrelated to my change.

[andygrunwald]

Hey @bossinc,
thanks a lot for this PR.
Do you have a link to the documentation for us where this is documented?

[bossinc]

https://developer.atlassian.com/cloud/jira/platform/rest/v2/api-group-issue-fields/#api-rest-api-2-field-get

Under Responses click Array<FieldDetails>. At the bottom of the popup box will be schema with a clickable type of JsonTypeBean. The documentation is here. I am not sure if there is a better way to find this. I feel like this was pretty obscure to find.

[andygrunwald]

Thanks @bossinc!
Overall it is looking good. One copy/paste mistake and two smaller things.
Let me know what you think about this.

[bossinc]

@andygrunwald thank you for for finding the copy/paste mistake and you are right to add the other two fields. Thank you!

[andygrunwald]

Thanks @bossinc