ltex-ls spawning too many forks/using too many threads

[acampove]

Describe the bug
When I check in htop I see that ltex-ls is spawning many threads, about 100. It seems that this plugin is not told to limit itself to 4.

Steps to reproduce
Open a Markdown file and let this plugin start spawning threads in a machine with many cores. Then go to htop and filter using F4 and type ltex-ls. Then type H (capital H) to show the threads.

Expected behavior
the plugin should take 2 or at most 4 threads

Sample document
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LTeX configuration
Please paste all configuration settings starting with ltex. from your settings.json. You can help us by temporarily removing some irrelevant settings from your settings.json and see if the bug still occurs.

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LTeX LS log
Paste the log (output) of LTeX LS here:

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Version information
List here the version information of the relevant software.

• Operating system: Linux (which distribution/version), macOS xx.xx, or Windows xx
• ltex-ls: x.xx
• Java: x.xx (usually obtained with java -version)

Additional context/information
You can add any other context or information about the problem here.