[connector/spanmetrics] - Explictly mark the field as deprecated (open-telemetry#41101)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

The field `dimensions_cache_size` was marked as deprecated without the
version information. We should follow upstream guidlines for
[deprecations](https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/coding-guidelines.md#api-breaking-changes).
And, then remove this field in next version.

Author: VihasMakwana

.chloggen/span-metrics-connector-deprecated.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: deprecation
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: spanmetricsconnector
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Mark dimensions_cache_size as deprecated following the upstream guidelines
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [41101]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

connector/spanmetricsconnector/config.go

@@ -49,7 +49,7 @@ type Config struct {
 	// DimensionsCacheSize defines the size of cache for storing Dimensions, which helps to avoid cache memory growing
 	// indefinitely over the lifetime of the collector.
 	// Optional. See defaultDimensionsCacheSize in connector.go for the default value.
-	// Deprecated:  Please use AggregationCardinalityLimit instead
+	// Deprecated [v0.130.0]:  Please use AggregationCardinalityLimit instead
 	DimensionsCacheSize int `mapstructure:"dimensions_cache_size"`
 
 	// ResourceMetricsCacheSize defines the size of the cache holding metrics for a service. This is mostly relevant for