FileID as a string

[danielnorkin]

Description:

This commit is to set FileID as a string. It allows to easily create a Hedera address book using FileID as a string instead of the original FileID instance.

This PR modifies ... in order to support ...

• Add config property
• Change column name
• Remove ... -->

Related issue(s):

Fixes #

Notes for reviewer:

Checklist

• [ ] Documented (Code comments, README, etc.)
• [ ] Tested (unit, integration, etc.)

[derek-meeco]

I do not think this PR is applicable anymore.

[Neurone]

Closing because it's superseded by the new v1 specifications.