minor: add higher-order function methods to SessionContext

[gstvg]

Which issue does this PR close?

Follow-up of #21679 that forgot to add these methods to SessionContext

Rationale for this change

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

[gstvg]

cc @rluvaton @comphead

[rluvaton]

If you added it to drop_function, shouldn't we also add it here?

[gstvg]

216542e
I think that drop_function works on all functions not only those registered via a FunctionFactory, and I wrongly thought that adding that variant would require a lot of changes and tests, so I left it for a future PR, but I checked it now and it's all user defined and nothing had to be changed/added (this match is the only usage of the Aggregate, Window and Table variants, for example), thanks

[github-actions]

Thank you for opening this pull request!

Reviewer note: cargo-semver-checks reported the current version number is not SemVer-compatible with the changes in this pull request (compared against the base branch).

Details

     Cloning origin/main
    Building datafusion v53.1.0 (current)
       Built [  86.524s] (current)
     Parsing datafusion v53.1.0 (current)
      Parsed [   0.036s] (current)
    Building datafusion v53.1.0 (baseline)
       Built [  88.067s] (baseline)
     Parsing datafusion v53.1.0 (baseline)
      Parsed [   0.035s] (baseline)
    Checking datafusion v53.1.0 -> v53.1.0 (no change; assume patch)
     Checked [   0.638s] 222 checks: 221 pass, 1 fail, 0 warn, 30 skip

--- failure enum_variant_added: enum variant added on exhaustive enum ---

Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.47.0/src/lints/enum_variant_added.ron

Failed in:
  variant RegisterFunction:HigherOrder in /home/runner/work/datafusion/datafusion/datafusion/core/src/execution/context/mod.rs:2169

     Summary semver requires new major version: 1 major and 0 minor checks failed
    Finished [ 176.936s] datafusion