v3: Remove optional tab autocompletion feature

[medikoo]

Reasoning:

• Performance is very poor due to slow command startup time
• tabtab package is no longer maintained and shares security issues
• Feature usage is relatively low (telemetry data shows 7% of users has the autocompletion on)

Closes: #8473

Addresses #10182

[codecov]

Codecov Report

Merging #10414 (4c25f91) into v3 (22b6de5) will increase coverage by 0.25%.
The diff coverage is n/a.

❗ Current head 4c25f91 differs from pull request most recent head 0b12363. Consider uploading reports for the commit 0b12363 to get more accurate results

@@            Coverage Diff             @@
##               v3   #10414      +/-   ##
==========================================
+ Coverage   83.14%   83.40%   +0.25%     
==========================================
  Files         346      339       -7     
  Lines       14115    13978     -137     
==========================================
- Hits        11736    11658      -78     
+ Misses       2379     2320      -59     

Impacted Files	Coverage Δ
lib/Serverless.js	66.66% <ø> (-0.16%)	⬇️
lib/classes/PluginManager.js	91.12% <ø> (-0.43%)	⬇️
lib/cli/commands-schema/no-service.js	100.00% <ø> (ø)
lib/plugins/config.js	69.38% <ø> (-6.23%)	⬇️
lib/utils/telemetry/generatePayload.js	91.20% <ø> (+0.29%)	⬆️
scripts/serverless.js	57.62% <ø> (+0.22%)	⬆️

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[pgrzesik]

Looks great, good call 👍

[mnapoli]

Should we also delete this documentation page: https://www.serverless.com/framework/docs/providers/aws/cli-reference/config-tabcompletion ?

[medikoo]

Should we also delete this documentation page: https://www.serverless.com/framework/docs/providers/aws/cli-reference/config-tabcompletion ?

Ouch, indeed I missed that. I've fixed it and updated merged commit