Resolve "Bug: lifetime constraints causing errors while combining functions"

Closes #28

See merge request !16

This fixes the compiler complaining about the arguments not living long enough or escaping the function.
Now the query functions can take external arguments and compose well together.

Fixes #28

Release: prepare and release 0.5.0

Closes #27

See merge request !15

Feat: support more functions (transform fns)

Closes #25

See merge request !13

Refactor: separate QryFunc name and args formatting

Closes #26

See merge request !14

Feat: initial support for handling multiple queries

Closes #24

See merge request !12

Release: prepare and release v0.4.0

Closes #18 and #16

See merge request !11

Feat: initial implementation of promql macro for validation

Closes #20

See merge request !10

Resolve "Feat: initial support for functions in the query builder API"

Closes #11 and #10

See merge request !7

Resolve "bug: Sealed trait causing lint errors"

Closes #15

See merge request !9

fixes #15

Resolve "Update repo level docs and release 0.3.0"

Closes #8

See merge request subcom/mquery!6

Resolve "Duration struct's fields are private"

Closes #7

See merge request subcom/mquery!5

Resolve "feat: Transform raw labels to custom data types"

Closes #3

See merge request subcom/mquery!3

Resolve "refactor: Replace QueryResult and Error type with internal types"

Closes #6

See merge request subcom/mquery!4

This removes the need for the user to import types from the `prometheus-http-query` crate where type annotations are required.
These changes also ensure that the public API of mquery remains more stable, as it is decoupled from the external types.