Adding aliases and policies blocks

[davidquirozibm]

Summary

Adds two new HCL allocation blocks to the identity benchmark which are aliases and policies. They follow the same pattern as the existing groups block. Both use preset modes (balanced / empty / full) or manual count + size for fine-grained control.

What Changed

• alias_count is now a total alias budget rather than a per-entity cap. parseAliases() resolves it into (aliasFill, aliasCap); enableUserpassMounts provisions one auth mount per alias slot to satisfy Vault's one-alias-per-accessor constraint. Cleanup tears down all slot mounts.
• policy_count creates placeholder ACL policies via createPolicies(). parsePolicies() resolves distribution into (polFill, polSize) and token_policies are attached to both entities and groups using selectPolicyNames(). Cleanup deletes all created policies.
• Both blocks support the same presets as groups: balanced (even spread), empty (suppress), full (every object gets the full budget), and manual count+size.

Validation

• go build ./benchmarktests/... passes cleanly.
• made sample hcls that test new changes, all run with out failure.

Notes

The policies block applies the same distribution independently to both entities and groups, a single block controls both.

[scellef]

LGTM!