Add filter building API

[christian-schilling]

No description provided.

[Copilot]

Pull request overview

This PR introduces a builder-style API for creating filters, replacing the previous function-based approach with method chaining. The refactoring changes calls like filter::chain(filter::nop(), other_filter) to Filter::new().chain(other_filter), and filter::empty() to Filter::new().empty().

• Adds builder methods to the Filter struct for constructing filter chains
• Migrates all filter construction code across the codebase to use the new API
• Removes standalone functions from build.rs like nop(), empty(), message(), file(), etc.

Reviewed changes

Copilot reviewed 9 out of 12 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
josh-core/src/filter/mod.rs	Adds builder methods to Filter struct; removes function exports; updates internal filter construction and comparison calls
josh-core/src/build.rs	Removes standalone filter builder functions (now methods on Filter)
josh-core/src/flang/parse.rs	Updates filter parsing to use builder API; changes make_op to make_filter
josh-core/src/lib.rs	Updates ACL filter construction to use new API
josh-core/src/housekeeping.rs	Updates empty() call to Filter::new().empty()
josh-core/src/history.rs	Updates filter comparison to use Filter::new()
josh-core/src/filter/tree.rs	Updates chain calls to use method syntax
josh-core/src/cache/cache.rs	Updates nop filter comparison to use Filter::new()
josh-proxy/src/bin/josh-proxy.rs	Updates filter construction and chaining to use builder methods
josh-graphql/src/graphql.rs	Updates filter comparisons from filter::nop() to Filter::new()
josh-cli/src/bin/josh.rs	Updates filter construction to use Filter::new().empty()
josh-cli/src/bin/josh-filter.rs	Updates filter construction and chaining with builder API

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