Add dropdown to select available Epoch types

[pendingintent]

On edit.html, add a drop down select to the epochs-section to choose from the list of available values.

Values to add to the dropdown come from SDTM Controlled Terminolgy where codelist_code=C99079.

API request https://library.cdisc.org/api/mdr/ct/packages/**sdtmct-2025-09-26**/codelists/C99079

Need to include the ability to choose the latest SDTM CT from the API. Currently sdtmct-2025-09-26

"terms": [
{
"conceptId": "C125938",
"definition": "A period in a clinical study after eligibility has been met and before the start of treatment, at which baseline measurements are collected.",
"preferredTerm": "Baseline Epoch",
"submissionValue": "BASELINE"
},
...

[pendingintent]

Added select dropdown to edit.html which provides the user with selections requested from the CDISC Library SDTM CT terminology through the API. The codelist_code for epoch types is C99079.

This feature is available when branch select-epoch-type is merged with master.