Nushell 0.30: Documentation, Improvements, and Bug Fixes

- [`math sqrt`](https://github.com/nushell/nushell/pull/3239) (luccasmmg) - [`any?` and `all?`](https://github.com/nushell/nushell/pull/3253) (andrasio) - [`path parse`, `path join`, and `path split`](https://github.com/nushell/nushell/pull/3256) (kubouch) - [`into int`](https://github.com/nushell/nushell/pull/3279) (efx) - [`query json`](https://github.com/nushell/nushell/pull/3327) (fdncred). This is a new experimental query function as we explore how we'd like to do data querying in nushell. ## Documentation (andrasio) We have a new [guide on how to create Nushell commands](https://github.com/nushell/nushell/pull/3326). ## Improvements (LhKipp, luccasmmg, waldyrious, ilius, fdncred, andrasio, DonnutPanic, ammrkn, sophiajt, schrieveslaach, daschl, nightscape) - Lots of internal optimization updates: [1](https://github.com/nushell/nushell/pull/3289), [2](https://github.com/nushell/nushell/pull/3292), [3](https://github.com/nushell/nushell/pull/3300), [4](https://github.com/nushell/nushell/pull/3301), [5](https://github.com/nushell/nushell/pull/3306) - Now [appends to the history instead of replacing it](https://github.com/nushell/nushell/pull/3314) - API improvements to [allow embedded nushell to have custom commands](https://github.com/nushell/nushell/pull/3309) - Internal implementation [improvements to `which`](https://github.com/nushell/nushell/pull/3310), [to `all`](https://github.com/nushell/nushell/pull/3312), [to `math` commands](https://github.com/nushell/nushell/pull/3315), [to `to` and `from` commands](https://github.com/nushell/nushell/pull/3320), [to `compact`](https://github.com/nushell/nushell/pull/3325) - Updated [`echo ..` to no longer prints integers](https://github.com/nushell/nushell/pull/3322) - Removed [help flags from the `$scope.commands` display](https://github.com/nushell/nushell/pull/3311) - Removed the [dupes in get_commands/get_command_names](https://github.com/nushell/nushell/pull/3308) - Fixes to [viewing Value as a filepath](https://github.com/nushell/nushell/pull/3305) - Move [arg deserialization out of `str`](https://github.com/nushell/nushell/pull/3294) - Cleaned up [error handling](https://github.com/nushell/nushell/pull/3297) - Fixes to how [rest arguments are handled](https://github.com/nushell/nushell/pull/3303) - Fixes to [`ansi rgb fg`](https://github.com/nushell/nushell/pull/3293) - Updated [the default prompt](https://github.com/nushell/nushell/pull/3291) - Autoview and table now [read from the in-memory config](https://github.com/nushell/nushell/pull/3287)

This section details documentation updates, improvements, and bug fixes in Nushell 0.30. It covers internal optimization updates, appending history instead of replacing it, API improvements for custom commands, internal improvements to commands like `which`, `all`, and `math`, updates to `echo ..`, fixes for filepath viewing and error handling, and updates to the default prompt. It also mentions autoview and table now reading from the in-memory config.