Lakshmi

Fixed
- Relaxed Python requirement to 3.7.

Added
- A new command `lak list accounts` that allows printing account values and
percentages by accounts or by account types.
Fixed
- The spinner chars were not showing properly on MS Windows 11. Changed to
a simpler spinner.

Added
- A new module `lakshmi.performance` that adds ability to checkpoint
portfolio balances and display stats about portfolio's performance over time.
- New commands in `lak` that exposes some functionality of the
`lakshmi.performance` module:
- `lak add checkpoint`
- `lak edit checkpoint`
- `lak delete checkpoint`
- `lak list checkpoints`
- `lak list performance`
- `lak info performance`
- Support in `.lakrc` to specify where the portfolio performance related data
(checkpoints) are stored.
Fixed
- Help message now shows default values for `lak analyze rebalance`.
- Added validation for I/EE bond purchase dates.

Added
- [New flag](https://github.com/sarvjeets/lakshmi/blob/develop/docs/lak.md#lakrc)
in `lak` + environment variable support for specifying the `.lakrc` file.
- Changelog (this file).
- Contributing guidelines and development instructions for Lakshmi.
Changed
- Dependabot is disbled for this project.
- Optimized away unnecessary calls when force refreshing the cached values
(`lak -r` flag).
Fixed
- Incorrect error handling when `.lakrc` file couldn't be parsed.

Added
- pre-commit CI now runs for every push and PRs.
Fixed
- Fix for assets with missing name fields (e.g. 'BTC-USD').
Thanks [bolapara](https://github.com/bolapara).

Added
- Doc-strings added to all the files.
- Dependabot to auto-update dependencies.
Fixed
- Documentation.