Declare indexer storage backends in the swh.indexer.storage.classes entry point

Normalize the indexer storage db for swh.core 3.6 with improved swh db handling capabilities.

Remove storage/test_init.py, it's now outdated.

Warning: this rename the config entry for indexer storages from 'indexer_storage' to 'indexer.storage'. Bw compat core handle this when loading the configuration for indexer cli tools and the api server only; generic loading mechanism will not handle the old name properly (i.e. when managing the storage db using swh db commands).

Also fix the cli to make them use SWH_CONFIG_FILENAME (if any).

Jenkins job DCIDX/gitlab-builds #211 failed in 1 min 13 sec.
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added 3 commits

• 85d0b81d - Declare indexer storage backends in the swh.indexer.storage.classes entry point
• 0d480dc5 - cli: make cli tools use the SWH_CONFIG_FILENAME env var (if any)
• 5e20e839 - move sql/ in swh/indexer/storage/

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Jenkins job DCIDX/gitlab-builds #212 failed in 2 min 1 sec.
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added 4 commits

• 15ddcab2 - 1 commit from branch swh/devel:master
• 8d65c3a2 - Declare indexer storage backends in the swh.indexer.storage.classes entry point
• bb3155b2 - cli: make cli tools use the SWH_CONFIG_FILENAME env var (if any)
• c982bfb5 - move sql/ in swh/indexer/storage/

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Jenkins job DCIDX/gitlab-builds #215 failed in 2 min 0 sec.
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added 2 commits

• 72706681 - cli: make cli tools use the SWH_CONFIG_FILENAME env var (if any)
• 9735321a - move sql/ in swh/indexer/storage/

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Jenkins job DCIDX/gitlab-builds #218 succeeded in 2 min 2 sec.
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added 4 commits

• 76857f77 - 1 commit from branch swh/devel:master
• b681d147 - Declare indexer storage backends in the swh.indexer.storage.classes entry point
• cd93e67b - cli: make cli tools use the SWH_CONFIG_FILENAME env var (if any)
• 24408502 - move sql/ in swh/indexer/storage/

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Jenkins job DCIDX/gitlab-builds #220 succeeded in 2 min 4 sec.
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merged