feat: add item hashing

[gadomski]

Description

Leaning pretty heavily on Claude, this adds a new Hasher structure that computes a sortable Z-order hash for a STAC Item. It also adds a (pretty complex) CLI command to prefix a hex hash onto STAC item ids.

To try it out:

$ cargo run -- hash scripts/fixtures/1000-sentinel-2-items.parquet | jq '.features.[].id' | (head; tail)
"69febadfa5bbcdbf-S2B_MSIL2A_20240828T174909_R141_T13TEF_20240828T214916"
"69feb3d97e9b6d24-S2B_MSIL2A_20240828T174909_R141_T13TEE_20240828T214916"
"69feba5fec9f5f37-S2B_MSIL2A_20240828T174909_R141_T13TDF_20240828T214916"
"69feb35b7ebb4d74-S2B_MSIL2A_20240828T174909_R141_T13TDE_20240828T214916"
"69feba4d3fdf5be6-S2B_MSIL2A_20240828T174909_R141_T13TCF_20240828T214916"
"69feb3493dff4f64-S2B_MSIL2A_20240828T174909_R141_T13TCE_20240828T214916"
"69fe9edd3f9afbe6-S2B_MSIL2A_20240828T174909_R141_T13TBF_20240828T214916"
"69fe97d93497fb2c-S2B_MSIL2A_20240828T174909_R141_T13TBE_20240828T214916"
"69fcfbfd3cd659ee-S2B_MSIL2A_20240828T174909_R141_T13SED_20240828T214916"
"69fcfaeb6ef64d27-S2B_MSIL2A_20240828T174909_R141_T13SEC_20240828T214916"
"20dc719720acaca6-S2A_MSIL2A_20240711T173911_R098_T13SEB_20240712T025100"
"20dc39b7b2a8bce5-S2A_MSIL2A_20240711T173911_R098_T13SEA_20240712T024752"
"20dc79a570ad3cec-S2A_MSIL2A_20240711T173911_R098_T13SDD_20240712T025103"
"20dc78a123ad3825-S2A_MSIL2A_20240711T173911_R098_T13SDC_20240712T024630"
"20dc7117698988a5-S2A_MSIL2A_20240711T173911_R098_T13SDB_20240712T025100"
"20dc3937fb891a75-S2A_MSIL2A_20240711T173911_R098_T13SDA_20240712T024831"
"20dc3927fb851cb6-S2A_MSIL2A_20240711T173911_R098_T13SCA_20240712T025137"
"20da8e07a1228035-S2A_MSIL2A_20240710T180921_R084_T12TXL_20240711T032121"
"20da87017322b4fe-S2A_MSIL2A_20240710T180921_R084_T12TXK_20240711T031353"
"20da28968129849b-S2B_MSIL2A_20240709T174909_R141_T13TEF_20240709T235809"

[gadomski]

I'm thinking the hash stuff should be its own library. I'm going to keep the PR open for now, but I expect to close it and re-open to use that library as a dep.

🤔 or maybe I keep it in this repo, and just make it its own crate?