Add logging and capture & style execution output

[theory]

Add extensive info, debug, and trace logging throughout. The CLI will style and emit log messages at the INFO level or higher.

Upgrade pgxn_meta to v0.6.0 and add a test to the API to ensure it can properly handle Meta API requests to api.pgxn.org, which adds fields supported by pgxn_meta v0.6.0.

Add the lines module, which defines a trait, line::WriteLine, for writing lines of text. It also defines two implementations: LineWriter, which simply writes lines to a std::io::Write, and ColorLine, which uses an owo_colors::Style to style a line before writing it to a std::io::Write. Use LineWriter to capture output during tests, so it doesn't appear in test output. Hopefully we'll also eventually be able to test that output, but for now ownership rules prevent it.

Add the exec module to set the directory context for the execution of a command and to stream its STDOUT and STDERR output to lines::WriteLine values. This allows for the styling and capturing of output.

Import the api and pg_config modules instead of making them directly public.

Remove the generics and lifetimes from most structs. This greatly simplifies building structs from other structs, and allows the exec::Executor to be passed to Pipeline constructors instead of a directory. This allows the module to set up the default execution output streaming, styling STDOUT in light grey and STDERR in red by streaming them to line::ColorLine structs that wrap our STDOUT and STDERR. Ultimately this configuration may move to consumers.

For better or worse, the need for the line writers to be mutable requires that the Pipelines be mutable, too.

[codecov]

Codecov Report

Attention: Patch coverage is 92.70073% with 10 lines in your changes missing coverage. Please review.

Project coverage is 96.91%. Comparing base (471396e) to head (0f7ea0b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib.rs	81.25%	9 Missing ⚠️
src/api/mod.rs	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   98.19%   96.91%   -1.28%     
==========================================
  Files          10       12       +2     
  Lines         499      584      +85     
==========================================
+ Hits          490      566      +76     
- Misses          9       18       +9     

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