HTTP servers and supporting Risor config updates

[myzie]

Adds new http module functions:

• http.listen_and_serve
• http.listen_and_serve_tls
• http.handle

Adds Risor configuration option:

• risor.WithListenersAllowed() - opts into allowing HTTP listeners

Refactor risor.Config struct in a mostly backwards compatible manner. Made the struct fields private so that using the option functions is the standard way of interacting with it, which was the standard pattern already.

Adds two mutexes to the VM to make two aspects concurrency-safe.

• Guarantees that a vm.Run() call when the VM is already running fails
• Prevent VM clones when loaded code and modules maps are being updated

go.mod updates:

go 1.22

toolchain go1.22.0

[codecov[bot]]

Codecov Report

Attention: 205 lines in your changes are missing coverage. Please review.

Comparison is base (6bddcff) 31.41% compared to head (039fe36) 30.83%.

Files	Patch %	Lines
modules/http/listen.go	28.43%	69 Missing and 4 partials :warning:
modules/http/response_writer.go	51.57%	40 Missing and 6 partials :warning:
vm/vm.go	75.71%	23 Missing and 11 partials :warning:
modules/http/http.go	33.33%	20 Missing :warning:
object/function.go	0.00%	8 Missing :warning:
risor_options.go	81.25%	6 Missing :warning:
vm/options.go	62.50%	6 Missing :warning:
risor_config.go	96.57%	3 Missing and 2 partials :warning:
modules/http/request.go	60.00%	2 Missing and 2 partials :warning:
object/thread.go	71.42%	2 Missing :warning:
... and 1 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #186 +/- ## ========================================== - Coverage 31.41% 30.83% -0.58% ========================================== Files 89 113 +24 Lines 12502 14517 +2015 ========================================== + Hits 3927 4476 +549 - Misses 8067 9483 +1416 - Partials 508 558 +50 ```

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