feat: add redb as an alternative to sqlite

[110CodingP]

Description

We currently only support sqlite persistence. This PR adds an alternative redb persistence by leveraging Summer Of Bitcoin work on bdk_redb.

Notes to the reviewers

The CI does not pass since bdk_redb has a MSRV of 1.85.0 which is in turn due to redb. Also bdk_redb is yet to published as a crate so currently we use the GitHub version of the same.

The following script tests a simple scenario of creating a wallet with bitcoind-rpc as chain source , sending funds to an address controlled by the wallet and creating a transaction using the wallet:

rm -rf ~/.bitcoin/regtest
rm -rf ~/.bdk-bitcoin

bitcoin-cli -rpcuser=alice -rpcpassword=password createwallet alice

export NETWORK=regtest

export EXT_DESCRIPTOR=$(bitcoin-cli -rpcwallet=alice -rpcuser=alice -rpcpassword=password listdescriptors true | jq -r '.descriptors | .[0] | .desc')

export INT_DESCRIPTOR=$(bitcoin-cli -rpcwallet=alice -rpcuser=alice -rpcpassword=password listdescriptors true | jq -r '.descriptors | .[1] | .desc')
 
 
export DATABASE_TYPE=redb
export CLIENT_TYPE=rpc
export SERVER_URL=127.0.0.1:18443

addr=$(bdk-cli wallet -w alice -a alice:password new_address | jq -r '.address')

bitcoin-cli -rpcuser=alice -rpcpassword=password -rpcwallet=alice generatetoaddress 102 $addr

bdk-cli wallet -w alice -a alice:password full_scan
bdk-cli wallet -w alice -a alice:password balance

recipient=$(bitcoin-cli  -rpcwallet=alice getrawchangeaddress)
psbt=$(bdk-cli wallet -w alice -a alice:password create_tx --to "$recipient:5000" | jq -r '.psbt')

signed_psbt=$(bdk-cli wallet -w alice -a alice:password sign $psbt | jq -r '.psbt')
bdk-cli wallet -w alice -a alice:password broadcast --psbt $signed_psbt

unset $addr

addr=$(bdk-cli wallet -w alice -a alice:password new_address | jq -r '.address')
bitcoin-cli -rpcuser=alice -rpcpassword=password -rpcwallet=alice generatetoaddress 1 $addr

bdk-cli wallet -w alice -a alice:password sync
bdk-cli wallet -w alice -a alice:password balance

the conf is as follows:

regtest=1

[regtest]
server=1
rpcuser=alice
rpcpassword=password 

Also removed sqlite from default features since we now have an alternative.

Changelog notice

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I ran cargo fmt and cargo clippy before committing

New Features:

• I've added tests for the new feature (test is in the PR description)
• I've added docs for the new feature
• I've updated CHANGELOG.md

[tvpeter]

I have not tested but I left a few comments.

I think it is a good idea to leave sqlite as the default db. Users can compile with no default features if they want to use redb. But when you open the PR, I will test it properly to have a better opinion.

In the meantime, a good job so far.

[coveralls]

Pull Request Test Coverage Report for Build 16288030656

Details

• 0 of 47 (0.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 2.838%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/persister.rs	0	14	0.0%
src/handlers.rs	0	33	0.0%

Totals
Change from base Build 15731603419:	0.2%
Covered Lines:	25
Relevant Lines:	881

---

💛 - Coveralls

[110CodingP]

I think it is a good idea to leave sqlite as the default db. Users can compile with no default features if they want to use redb. But when you open the PR, I will test it properly to have a better opinion.

Made sqlite a default feature again.