Add `no_std` support to `kairos-tx` #168

coverage

File	Coverage
All files	`61%`	✅
kairos-test-utils/src/cctl.rs	`87%`	✅
kairos-server/src/config.rs	`0%`	❌
kairos-server/src/errors.rs	`16%`	❌
kairos-server/src/utils.rs	`22%`	❌
kairos-server/src/routes/deposit.rs	`86%`	✅
kairos-server/src/routes/transfer.rs	`73%`	✅
kairos-server/src/routes/withdraw.rs	`91%`	✅
kairos-server/tests/transactions.rs	`83%`	✅
kairos-test-utils/src/cctl/parsers.rs	`66%`	✅
kairos-tx/src/asn.rs	`77%`	✅
kairos-tx/src/error.rs	`0%`	❌
kairos-crypto/src/implementations/casper.rs	`3%`	❌

Minimum allowed coverage is 60%

Generated by 🐒 cobertura-action against 3994e2a