feat: Allow more customization for transfer speeds

[SammCheese]

Description

This PR adds an Input field and a unit selector to transfer speeds.
This allows the user to Tweak speeds more to their likings.
Images Attached

Related Issues

Fixes #808
Fixes #1231
Fixes #860

Checklist:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you linted your code locally prior to submission?
• Have you successfully ran app with your changes locally?

[agalwood]

I think it is possible to maintain the original maxOverallDownloadLimit and maxOverallUploadLimit data structures. There is no need to introduce uploadUinit and downloadUnit in userKeys. You can get units (G, M, K) through parseInt and then replace, and computed to uploadUnit and downloadUnit.

[SammCheese]

This should address your concerns regarding userKeys and the change of data structures.

[agalwood]

Nice job! Thanks for your contribution 👍

[shatyuka]

I got maxOverallDownloadLimit = number 0 here, means no limitation.

Motrix/src/renderer/components/Preference/Basic.vue

Lines 415 to 417 in 7201f17

	downloadUnits: {
	get () {
	const speedEnding = this.form.maxOverallDownloadLimit?.slice(-1)

Motrix/src/renderer/components/Preference/Basic.vue

Lines 401 to 406 in b4df97b

	speedOptions () {
	return [
	{
	label: this.$t('preferences.transfer-speed-unlimited'),
	value: 0
	},

So it's not upgradable from older version.

[SammCheese]

I have not considered that. I will try to fix that as soon as i can.