Update Qnnpack Fully Connected Sparse Op to Store Variable Size Indices (#85243)
Only uint32_t is supported for now, but uint16_t and uint8_t support will be added in future diffs.
Differential Revision: [D38828545](https://our.internmc.facebook.com/intern/diff/D38828545/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85243
Approved by: https://github.com/kimishpatel
