Allow specifying @service module name

[omus]

Allow users to specify the module name when using @service via @service <service_id> as <module_name> (mirroring import Pkg as P). This change is backwards compatible and the test suite around @service has been significantly improved.

Provides a work around for the issue: #716

---

• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1210525583822225

[omus]

Getting the doctests working for the examples using STS.get_caller_identity are being a pain so I'll disable them. I'll make an issue for this:

Error: doctest failure in ~/work/AWS.jl/AWS.jl/src/AWS.jl:148-158

```jldoctest service
julia> using AWS: @service

julia> @service STS
STS

julia> STS.get_caller_identity()
OrderedCollections.LittleDict{Union{String, Symbol}, Any, Vector{Union{String, Symbol}}, Vector{Any}} with 2 entries:
  "GetCallerIdentityResult" => LittleDict{Union{String, Symbol}, Any, Vector{Un…
  "ResponseMetadata"        => LittleDict{Union{String, Symbol}, Any, Vector{Un…
```

Subexpression:

STS.get_caller_identity()

Evaluated output:

ERROR: HTTP.Exceptions.StatusError(400, "PUT", "/latest/api/token", HTTP.Messages.Response:
"""
HTTP/1.1 400 Bad Request
Content-Type: text/xml; charset=utf-8
Server: Microsoft-IIS/10.0
Date: Thu, 12 Jun 2025 16:13:12 GMT
Content-Length: 322

<?xml version="1.0" encoding="utf-8"?>
<Error xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <Code>InvalidHttpVerb</Code>
    <Message>The HTTP verb specified was not recognized by the server.</Message>
    <Details>'PUT' is not a supported verb.</Details>
</Error>""")
Stacktrace:
  [1] refresh_token!(session::AWS.IMDS.Session, duration::Int16)
    @ AWS.IMDS ~/work/AWS.jl/AWS.jl/src/IMDS.jl:94
  [2] refresh_token!
    @ ~/work/AWS.jl/AWS.jl/src/IMDS.jl:53 [inlined]
  [3] request(session::AWS.IMDS.Session, method::String, path::String; kwargs::@Kwargs{})
    @ AWS.IMDS ~/work/AWS.jl/AWS.jl/src/IMDS.jl:104
  [4] request
    @ ~/work/AWS.jl/AWS.jl/src/IMDS.jl:100 [inlined]
  [5] get(session::AWS.IMDS.Session, path::String)
    @ AWS.IMDS ~/work/AWS.jl/AWS.jl/src/IMDS.jl:168
  [6] get
    @ ~/work/AWS.jl/AWS.jl/src/IMDS.jl:180 [inlined]
  [7] ec2_instance_credentials(profile::String)
    @ AWS ~/work/AWS.jl/AWS.jl/src/AWSCredentials.jl:233
  [8] (::AWS.var"#12#18"{String})()
    @ AWS ~/work/AWS.jl/AWS.jl/src/AWSCredentials.jl:132
  [9] AWS.AWSCredentials(; profile::Nothing, throw_cred_error::Bool)
    @ AWS ~/work/AWS.jl/AWS.jl/src/AWSCredentials.jl:138
 [10] AWSCredentials
    @ ~/work/AWS.jl/AWS.jl/src/AWSCredentials.jl:113 [inlined]
 [11] AWS.AWSConfig()
    @ AWS ~/work/AWS.jl/AWS.jl/src/AWSConfig.jl:32
 [12] #global_aws_config#89
    @ ~/work/AWS.jl/AWS.jl/src/AWS.jl:82 [inlined]
 [13] global_aws_config
    @ ~/work/AWS.jl/AWS.jl/src/AWS.jl:80 [inlined]
 [14] get_caller_identity()
    @ STS ~/work/AWS.jl/AWS.jl/src/services/sts.jl:722
 [15] top-level scope
    @ none:1

Expected output:

OrderedCollections.LittleDict{Union{String, Symbol}, Any, Vector{Union{String, Symbol}}, Vector{Any}} with 2 entries:
  "GetCallerIdentityResult" => LittleDict{Union{String, Symbol}, Any, Vector{Un…
  "ResponseMetadata"        => LittleDict{Union{String, Symbol}, Any, Vector{Un…

[omus]

I think my Documenter issues will be fixed by #723

[omus]

I just noticed that due to testing with multiple backends my @service tests were running twice which causes the modules they create to be re-created and produce a warning. To avoid that I have started to separate the unit tests from the integration tests. This is something I thought of doing when we switched to merge queues in #713 but didn't have a reason to do it yet.

I've just moved the tests I've made here to be in the unit test category and we'll need to refactor the remaining tests in another PR.