fully define a corresponding Builder for each ParamSpec

Squashed commit of the following:

commit b1f3ce8
Merge: 8873941 a3a291a
Author: ranfdev <ranfdev@gmail.com>
Date:   Sun Feb 20 15:23:16 2022 +0100

    merge upstream

commit 8873941
Author: ranfdev <ranfdev@gmail.com>
Date:   Sun Feb 20 14:21:28 2022 +0100

    add #[must_use] on the entire builder type

commit a2bb5fb
Author: ranfdev <ranfdev@gmail.com>
Date:   Sun Feb 20 14:21:00 2022 +0100

    make ParamSpec*Builder new fn private, add missing builder method

commit 5cf1929
Author: ranfdev <ranfdev@gmail.com>
Date:   Sat Feb 19 14:13:03 2022 +0100

    improve flags comments for ParamSpec*Builder

commit 5bf22b2
Author: ranfdev <ranfdev@gmail.com>
Date:   Sat Feb 19 12:28:03 2022 +0100

    clearer missing parameter in ParamSpec*Builder

commit 3d28cdb
Author: ranfdev <ranfdev@gmail.com>
Date:   Sat Feb 19 12:20:18 2022 +0100

    add required param in ParamSpecOverriddenBuilder

commit 7e5a6fc
Author: ranfdev <ranfdev@gmail.com>
Date:   Fri Feb 18 17:11:48 2022 +0100

    add missing must_use

commit b7a6fc6
Author: ranfdev <ranfdev@gmail.com>
Date:   Fri Feb 18 17:07:12 2022 +0100

    Add required arguments on `ParamSpec` builders

commit f677656
Author: ranfdev <ranfdev@gmail.com>
Date:   Fri Feb 18 10:03:47 2022 +0100

    refactor, correctly handle `flags` in `ParamSpec*Builder`

commit bbba561
Author: ranfdev <ranfdev@gmail.com>
Date:   Thu Feb 17 18:44:50 2022 +0100

    Add missing ParamSpec builders, add define_builder_numeric

commit 6be1563
Author: ranfdev <ranfdev@gmail.com>
Date:   Wed Feb 16 19:03:11 2022 +0100

    add must use on methods returning Self

commit 6cc4771
Author: ranfdev <ranfdev@gmail.com>
Date:   Wed Feb 16 18:24:59 2022 +0100

    set builder is_a_type value to crate::Type::UNIT

commit 33da4d4
Author: ranfdev <ranfdev@gmail.com>
Date:   Wed Feb 16 17:02:39 2022 +0100

    improve  test

commit 427ad4b
Author: ranfdev <ranfdev@gmail.com>
Date:   Wed Feb 16 17:01:19 2022 +0100

    remove default value for required ParamSpecBuilder values

commit c3792b0
Author: ranfdev <ranfdev@gmail.com>
Date:   Tue Feb 1 23:20:35 2022 +0100

    define a corresponding `Builder` for each `ParamSpec`

Author: ranfdev