Separate config from Client struct in net.smtp

[einar-hjortdal]

Describe the feature

Currently, a Client struct must be created to configure a new smtp client, the new_client function expects a Client parameter.
The same function also returns a Client struct.
It would be more user friendly for new_client to expect a smtp.Config struct and return a smtp.Client instead.

Use Case

Makes it clearer and easier to use the smtp module.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Version used

Current V version: V 0.4.3 976c5fb, timestamp: 2023-11-18 14:47:04 +0200

Environment details (OS name and version, etc.)

V full version: V 0.4.3 95509cf.976c5fb
OS: linux, Linux version 5.14.0-362.8.1.el9_3.x86_64 (mockbuild@pp-el9) (gcc (GCC) 11.4.1 20230605 (Red Hat 11.4.1-2), GNU ld version 2.35.2-42.el9) #1 SMP PREEMPT_DYNAMIC Tue Nov 7 18:43:14 CET 2023
Processor: 8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz

getwd: /home/coachonko/Documents/projects/vlang/peony
vexe: /home/coachonko/.local/lib64/v/v
vexe mtime: 2023-11-18 15:29:57

vroot: OK, value: /home/coachonko/.local/lib64/v
VMODULES: OK, value: /home/coachonko/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.39.3
Git vroot status: weekly.2023.45.1-76-g976c5fba
.git/config present: true

CC version: cc (GCC) 11.4.1 20230605 (Red Hat 11.4.1-2)
thirdparty/tcc status: thirdparty-linux-amd64 12f392c3

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