create issue/createMeta and issue/editMeta functions

[sanslash332]

So that the title says; can you add to the api these functions?

For now these are usable to get alld customfields options for a specific context :)

So, thanks :)

[randyho-kk]

add getCreateIssueMeta and getEditIssueMeta functions to the API.

https://docs.atlassian.com/jira/REST/latest/#api/2/issue-getCreateIssueMeta
https://docs.atlassian.com/jira/REST/latest/#api/2/issue-getEditIssueMeta

[sanslash332]

thanks @randyho-kk for add the details for this enhancement :)