<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
Generates simple histograms using telemetrygen
<!-- Issue number (e.g. open-telemetry#1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes

<!--Describe what testing was performed and which tests were added.-->
#### Testing
Test with a local otel collector with debug output

```
bin/telemetrygen metrics --metrics 5  --otlp-http --otlp-endpoint "localhost:4318"    --metric-type Histogram --otlp-insecure 
```
Output from debug Exporter: 
```
Resource SchemaURL: https://opentelemetry.io/schemas/1.13.0
ScopeMetrics #0
ScopeMetrics SchemaURL:
InstrumentationScope
Metric #0
Descriptor:
     -> Name: gen
     -> Description:
     -> Unit:
     -> DataType: Histogram
     -> AggregationTemporality: Cumulative
HistogramDataPoints #0
StartTimestamp: 2024-11-13 16:22:50.633365 +0000 UTC
Timestamp: 2024-11-13 16:22:51.633367 +0000 UTC
Count: 0
Sum: 0.000000
ExplicitBounds #0: 0.000000
ExplicitBounds #1: 1.000000
ExplicitBounds #2: 2.000000
ExplicitBounds open-telemetry#3: 3.000000
ExplicitBounds open-telemetry#4: 4.000000
Buckets #0, Count: 0
Buckets #1, Count: 0
Buckets #2, Count: 0
Buckets open-telemetry#3, Count: 0
Buckets open-telemetry#4, Count: 0
ResourceMetrics #1
Resource SchemaURL: https://opentelemetry.io/schemas/1.13.0
ScopeMetrics #0
ScopeMetrics SchemaURL:
InstrumentationScope
Metric #0
Descriptor:
     -> Name: gen
     -> Description:
     -> Unit:
     -> DataType: Histogram
     -> AggregationTemporality: Cumulative
HistogramDataPoints #0
StartTimestamp: 2024-11-13 16:22:50.639942 +0000 UTC
Timestamp: 2024-11-13 16:22:51.639942 +0000 UTC
Count: 1
Sum: 1.000000
ExplicitBounds #0: 0.000000
ExplicitBounds #1: 1.000000
ExplicitBounds #2: 2.000000
ExplicitBounds open-telemetry#3: 3.000000
ExplicitBounds open-telemetry#4: 4.000000
Buckets #0, Count: 0
Buckets #1, Count: 1
Buckets #2, Count: 0
Buckets open-telemetry#3, Count: 0
Buckets open-telemetry#4, Count: 0
ResourceMetrics #2
Resource SchemaURL: https://opentelemetry.io/schemas/1.13.0
ScopeMetrics #0
ScopeMetrics SchemaURL:
InstrumentationScope
Metric #0
Descriptor:
     -> Name: gen
     -> Description:
     -> Unit:
     -> DataType: Histogram
     -> AggregationTemporality: Cumulative
HistogramDataPoints #0
StartTimestamp: 2024-11-13 16:22:50.6404 +0000 UTC
Timestamp: 2024-11-13 16:22:51.640401 +0000 UTC
Count: 2
Sum: 4.000000
ExplicitBounds #0: 0.000000
ExplicitBounds #1: 1.000000
ExplicitBounds #2: 2.000000
ExplicitBounds open-telemetry#3: 3.000000
ExplicitBounds open-telemetry#4: 4.000000
Buckets #0, Count: 0
Buckets #1, Count: 1
Buckets #2, Count: 0
Buckets open-telemetry#3, Count: 1
Buckets open-telemetry#4, Count: 0
ResourceMetrics open-telemetry#3
Resource SchemaURL: https://opentelemetry.io/schemas/1.13.0
ScopeMetrics #0
ScopeMetrics SchemaURL:
InstrumentationScope
Metric #0
Descriptor:
     -> Name: gen
     -> Description:
     -> Unit:
     -> DataType: Histogram
     -> AggregationTemporality: Cumulative
HistogramDataPoints #0
StartTimestamp: 2024-11-13 16:22:50.640729 +0000 UTC
Timestamp: 2024-11-13 16:22:51.640729 +0000 UTC
Count: 3
Sum: 3.000000
ExplicitBounds #0: 0.000000
ExplicitBounds #1: 1.000000
ExplicitBounds #2: 2.000000
ExplicitBounds open-telemetry#3: 3.000000
ExplicitBounds open-telemetry#4: 4.000000
Buckets #0, Count: 1
Buckets #1, Count: 1
Buckets #2, Count: 1
Buckets open-telemetry#3, Count: 0
Buckets open-telemetry#4, Count: 0
ResourceMetrics open-telemetry#4
Resource SchemaURL: https://opentelemetry.io/schemas/1.13.0
ScopeMetrics #0
ScopeMetrics SchemaURL:
InstrumentationScope
Metric #0
Descriptor:
     -> Name: gen
     -> Description:
     -> Unit:
     -> DataType: Histogram
     -> AggregationTemporality: Cumulative
HistogramDataPoints #0
StartTimestamp: 2024-11-13 16:22:50.641073 +0000 UTC
Timestamp: 2024-11-13 16:22:51.641073 +0000 UTC
Count: 4
Sum: 12.000000
ExplicitBounds #0: 0.000000
ExplicitBounds #1: 1.000000
ExplicitBounds #2: 2.000000
ExplicitBounds open-telemetry#3: 3.000000
ExplicitBounds open-telemetry#4: 4.000000
Buckets #0, Count: 0
Buckets #1, Count: 0
Buckets #2, Count: 1
Buckets open-telemetry#3, Count: 2
Buckets open-telemetry#4, Count: 1
        {"kind": "exporter", "data_type": "metrics", "name": "debug"}
```
<!--Describe the documentation added.-->
#### Documentation

<!--Please delete paragraphs that you did not use before submitting.-->

---------

Co-authored-by: Pablo Baeyens <[email protected]>