Added new env variable and speech function for alternative TTS voice

[meta-fx]

Background

This change was introduced to provide users with an alternative TTS voice option using the StreamElements API. It allows users to switch between the default TTS voice and the new alternative voice easily.

Changes

1.) Added a new brian_speech function to the speech.py file, which utilizes the StreamElements API for an alternative TTS voice.
2.) Added a new environment variable and modified the config.py file to account for the new environment variable so that users to choose between the default TTS voice and the alternative voice.

Documentation

The changes made in this pull request are documented in the code through comments, explaining the purpose of the new function and the environment variable.

Test Plan

1.) Tested the new function with various text inputs to ensure that the alternative TTS voice works as expected.
2.) Tested the environment variable by toggling its value and verified that the selected TTS voice is used accordingly.

PR Quality Checklist

• [✅] My pull request is atomic and focuses on a single change.
• [✅] I have thouroughly tested my changes with multiple different prompts.
• [✅] I have considered potential risks and mitigations for my changes.
• [✅] I have documented my changes clearly and comprehensively.
• [✅] I have not snuck in any "extra" small tweaks changes

[alexonab]

There seem to be unnecessary new lines added that are not needed for the proposed change functionality.

[meta-fx]

There seem to be unnecessary new lines added that are not needed for the proposed change functionality.

Yeah I noticed that afterwards, my editor formats my code and adds unnecessary lines. I need to fix that and try again.

[nponeccop]

Remove occasionally introduced whitespace changes

[nponeccop]

Add a final newline

[nponeccop]

@meta-fx There are conflicts now

[nponeccop]

You still need to add that newline you removed back. Just press Enter in your editor at the end of .env.template once. People keep adding and removing newlines creating conflicts. It isn't good, and the right way is to have the final line separator. Some editors keep removing it, vim insist in adding it.

[richbeales]

please fix flake8

scripts/speak.py:55:1: E302 expected 2 blank lines, found 1
scripts/speak.py:72:1: E302 expected 2 blank lines, found 1

then this can be merged. Thanks