Removed plugin prefixes from converter and merger paths

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing issue: fixes Cleanup: standardize ruleConverters/* paths internally #1197
• That issue was marked as status: accepting prs

Overview

Flattens the converter and mergers directories to not rely on plugin-specific folders.

[JoshuaKGoldberg]

@rafaelss95 - I'll leave this for a day in case you have opinions 🙂

[rafaelss95]

Hmmm, I see what you mentioned in #1197 (comment)... in this case wouldn't it be better then to use the original rule name as the file name + the converter function to keep them grouped, making it easier not only to search but also to read this huge amount of files together? I mean:

avoid-dispatching-multiple-actions-sequentially / convertAvoidDispatchingMultipleActionsSequentially -> ngrx-avoid-dispatching-multiple-actions-sequentially / convertNgrxAvoidDispatchingMultipleActionsSequentially
ban-operators / convertBanOperators -> rxjs-ban-operators / convertRxjsBanOperators

About the others which doesn't have a prefix (codelyzer, sonar, etc.), I think we can leave it as is.

[JoshuaKGoldberg]

All right, sorry that took so long @rafaelss95! I believe I got everything under the original name. Please let me know if I missed any / got any wrong!