[receiver/filestats] new component filestatsreceiver

[atoulme]

Description:
Adds the structure of the filestatsreceiver, implementation will follow in a separate PR.

Link to tracking Issue:
#19729

Testing:
Simple unit test for config.

Documentation:
README.md. Metrics defined in metadata.yaml.

[runforesight]

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build-and-test-windows duration(6 seconds) has decreased 31 minutes 49 seconds compared to main branch avg(31 minutes 55 seconds).

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⭕  build-and-test-windows workflow has finished in 6 seconds (31 minutes 49 seconds less than main branch avg.) and finished at 30th Mar, 2023.

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windows-unittest-matrix	-     🔗	N/A	See Details
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✅  telemetrygen workflow has finished in 1 minute 17 seconds and finished at 30th Mar, 2023.

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✅  changelog workflow has finished in 2 minutes 7 seconds and finished at 30th Mar, 2023.

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✅  build-and-test workflow has finished in 40 minutes 51 seconds (5 minutes 22 seconds less than main branch avg.) and finished at 30th Mar, 2023.

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unittest-matrix (1.19, connector)	-     🔗	✅ 126  ❌ 0  ⏭ 0    🔗	See Details
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unittest-matrix (1.19, receiver-0)	-     🔗	✅ 2623  ❌ 0  ⏭ 0    🔗	See Details
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unittest-matrix (1.19, receiver-1)	-     🔗	✅ 1965  ❌ 0  ⏭ 0    🔗	See Details
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✅  prometheus-compliance-tests workflow has finished in 12 minutes 56 seconds (⚠️ 6 minutes 42 seconds more than main branch avg.) and finished at 30th Mar, 2023.

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prometheus-compliance-tests	-     🔗	✅ 21  ❌ 0  ⏭ 0    🔗	See Details

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✅  load-tests workflow has finished in 15 minutes 39 seconds (⚠️ 5 minutes 21 seconds more than main branch avg.) and finished at 30th Mar, 2023.

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✅  e2e-tests workflow has finished in 17 minutes 22 seconds (⚠️ 3 minutes 17 seconds more than main branch avg.) and finished at 30th Mar, 2023.

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kubernetes-test (v1.26.0)	-     🔗	N/A	See Details
kubernetes-test (v1.25.3)	-     🔗	N/A	See Details
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kubernetes-test (v1.23.13)	-     🔗	N/A	See Details

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[atoulme]

@dmitryax please let me know if the changes look good to you, thanks!

[dmitryax]

LGTM