Use resizable text input for actions that make use of textarea fields

Issue information

From user: mxh

Related to !75 (merged)

Contribution record

Fork management

Problem/Motivation

Some actions need a textarea for setting up properly. For example the Send email action makes use of a textarea for setting up the message.

Steps to reproduce

Proposed resolution

We should support a resizable text input for such config fields.

Remaining tasks

Implement.

User interface changes

API changes

Data model changes

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