feat(storage): prefix & range utils

[BugenZhao]

What's changed and what's your intention?

This PR introduces range_of_prefix and prefixed_range utilities to avoid misusing next_key, and also refactors several usages in the relational table.

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Refer to a related PR or issue link (optional)

• Close storage: should check whether next_key is empty #3215

[codecov]

Codecov Report

Merging #3217 (42f2993) into main (a42753a) will increase coverage by 0.02%.
The diff coverage is 55.35%.

❗ Current head 42f2993 differs from pull request most recent head 6f77aaf. Consider uploading reports for the commit 6f77aaf to get more accurate results

@@            Coverage Diff             @@
##             main    #3217      +/-   ##
==========================================
+ Coverage   73.52%   73.54%   +0.02%     
==========================================
  Files         744      745       +1     
  Lines      101452   101606     +154     
==========================================
+ Hits        74590    74725     +135     
- Misses      26862    26881      +19     

Flag	Coverage Δ
rust	73.54% <55.35%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/storage/src/table/cell_based_table.rs	71.12% <25.00%> (-0.55%)	⬇️
src/storage/hummock_sdk/src/key.rs	74.10% <34.48%> (-15.90%)	⬇️
src/storage/src/keyspace.rs	89.69% <100.00%> (ø)
src/storage/src/table/state_table.rs	88.26% <100.00%> (+4.77%)	⬆️
src/storage/src/table/test_relational_table.rs	98.07% <100.00%> (ø)
src/storage/src/table/mem_table.rs	64.51% <0.00%> (-8.07%)	⬇️
...ecutor/managed_state/top_n/top_n_bottom_n_state.rs	77.63% <0.00%> (-5.08%)	⬇️
src/meta/src/hummock/mock_hummock_meta_client.rs	42.85% <0.00%> (-1.10%)	⬇️
...am/src/executor/managed_state/top_n/top_n_state.rs	93.02% <0.00%> (-0.50%)	⬇️
... and 14 more

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[wcy-fdu]

LGTM!