Fix AOF rewrite and restore BF tests

[arpitbbhayani]

The AOF rewrite tests were failing because bloom filter data was not being properly restored after server restart. The root cause was twofold:

1. BF.LOAD command was replicating during AOF loading, causing duplicate entries
2. Tests were not properly configuring AOF persistence for server restart

Changes:

• Modified BF.LOAD handler to skip replication when loading from AOF by checking must_obey_client() context
• Updated AOF tests to enable appendonly before adding data
• Added wait for initial AOF rewrite to prevent concurrent rewrites
• Set appendonly in server startup args for proper AOF loading on restart

Also includes minor fixes:

• Changed build.sh shebang to bash for better compatibility
• Updated pytest requirement to 7.4.3
• Fixed indentation in utils.rs documentation

Fixes #74

[enjoy-binbin]

@arpitbbhayani can you fix the DCO?

[arpitbbhayani]

Thank you so much for reviewing the code. Apologies that it took some time for me to come back. I have addressed all the concerns and made the changes.

Now, the PR only fixes the AOF tests that were failing and other changes have been reverted.