585: Problem:(CRO-542) no integration test for hd-wallet r=tomtau a=leejw51

Solution: add hdwallet integration test

Co-authored-by: Jongwhan Lee <jonghwan@crypto.com>

613: Problem: (CRO-603) Bech32 address always encoded with initialized network r=tomtau a=calvinlauco

Solution: Add network argument to to_cro()

---
`to_cro()` always encoded with the initialized network, making it mpossible to encode to arbitrary network

615: Bump serde_json from 1.0.41 to 1.0.42 r=tomtau a=dependabot-preview[bot]

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.41 to 1.0.42.
<details>
<summary>Release notes</summary>

*Sourced from [serde_json's releases](https://github.com/serde-rs/json/releases).*

> ## v1.0.42
> - Add `impl From<()> for Value` which produces Value::Null ([#585](https://github-redirect.dependabot.com/serde-rs/json/issues/585), thanks [@&#8203;Nilix007](https://github.com/Nilix007))
</details>
<details>
<summary>Commits</summary>

- [`f0471e6`](serde-rs/json@f0471e6) Release 1.0.42
- [`bf8cc66`](serde-rs/json@bf8cc66) Merge pull request [#585](https://github-redirect.dependabot.com/serde-rs/json/issues/585) from Nilix007/add_from_unit_for_value
- [`ff5a59c`](serde-rs/json@ff5a59c) Add `impl From\<()> for Value`
- [`7dda823`](serde-rs/json@7dda823) Merge pull request [#580](https://github-redirect.dependabot.com/serde-rs/json/issues/580) from andrisak/docs_read_without_blocking_eof
- [`2065227`](serde-rs/json@2065227) Added missing fake_main [#522](https://github-redirect.dependabot.com/serde-rs/json/issues/522)
- [`3a5aba3`](serde-rs/json@3a5aba3) Fix for Document how to deserialize from a prefix of an io::Read without bloc...
- [`0c72820`](serde-rs/json@0c72820) Ignore must_use_candidate pedantic lint
- [`265f1ca`](serde-rs/json@265f1ca) Upgrade to rustversion 1.0
- [`b63ad14`](serde-rs/json@b63ad14) Address needless_doctest_main lint
- See full diff in [compare view](serde-rs/json@v1.0.41...v1.0.42)
</details>
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Co-authored-by: Calvin Lau <calvinlauco@gmail.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>