bdk_chain 0.23.0 drops with SPK cache support for faster wallet startup ⚡

This marks another step in nostr:nprofile1qqsgkmgkmv63djkxmwvdlyaxx0xtsytvkyyg5fwzmp48pwd30f3jtxsppemhxue69uhkummn9ekx7mp0qy0hwumn8ghj7erjv4sk6mmxw35x2wfswvhxummnw3erztnrdakj76wuhtn ‘s transition toward modular libraries.

nostr:nprofile1qqsw3znfr6vdnxrujezjrhlkqqjlvpcqx79ys7gcph9mkjjsy7zsgygpz3mhxue69uhhyetvv9ujuerpd46hxtnfduq32amnwvaz7tm9v3jkutnwdaehgu3wd3skueqa3tvg5 and nostr:nprofile1qqsy8us3d6u5ynddk7lq7yz365hqqsptzd2923fvkgj4eepsady08uspz3mhxue69uhhyetvv9ujuerpd46hxtnfduq3jamnwvaz7tmjv4kxz7fwd45ku6tzd968xtnrv9eks8nytq7 explain the benefits of this shift in BR097.