[SPARK-46132][CORE] Support key password for JKS keys for RPC SSL #44264
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What changes were proposed in this pull request?
Add support for a separate key password in addition to the key store password for JKS keys. This is needed for keys which may have a key password in addition to a key store password. We already had this support for the UI SSL support, so for compatibility we should have it here.
This wasn't done earlier as I wasn't sure how to implement it but the discussion in #43998 (comment) suggested the right way.
Why are the changes needed?
These are needed to support users who may have such keys configured.
Does this PR introduce any user-facing change?
No
How was this patch tested?
Added some unit tests
Was this patch authored or co-authored using generative AI tooling?
No