Do not expose runtime.internal imports in runtime.api package

[Nadeeshan96]

Purpose

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$title
Fixes #38077

Approach

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Samples

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Remarks

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Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov]

Codecov Report

Patch coverage: 82.60% and project coverage change: -3.41 ⚠️

Comparison is base (71a0cb0) 80.67% compared to head (0485e50) 77.26%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #40212      +/-   ##
============================================
- Coverage     80.67%   77.26%   -3.41%     
+ Complexity    76007    54361   -21646     
============================================
  Files          3409     3349      -60     
  Lines        260999   201712   -59287     
  Branches      45660    25889   -19771     
============================================
- Hits         210552   155854   -54698     
+ Misses        41621    37420    -4201     
+ Partials       8826     8438     -388     

Impacted Files	Coverage Δ
...java/io/ballerina/runtime/api/PredefinedTypes.java	100.00% <ø> (ø)
...io/ballerina/runtime/api/async/StrandMetadata.java	100.00% <ø> (ø)
...lerina/runtime/api/constants/RuntimeConstants.java	100.00% <ø> (+5.26%)	⬆️
...ballerina/runtime/api/constants/TypeConstants.java	100.00% <ø> (+33.33%)	⬆️
...o/ballerina/runtime/api/creators/ErrorCreator.java	64.28% <ø> (ø)
...io/ballerina/runtime/api/creators/TypeCreator.java	68.42% <ø> (ø)
...o/ballerina/runtime/api/creators/ValueCreator.java	62.06% <ø> (-1.15%)	⬇️
...java/io/ballerina/runtime/api/types/ArrayType.java	100.00% <ø> (ø)
...java/io/ballerina/runtime/api/types/Parameter.java	58.33% <ø> (ø)
...java/io/ballerina/runtime/api/utils/TypeUtils.java	20.00% <ø> (+0.82%)	⬆️
... and 55 more

... and 462 files with indirect coverage changes

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[Nadeeshan96]

Created #40337 to change Runtime, Future, Environment APIs to interfaces.

[Nadeeshan96]

CI Full Build Ubuntu / Build Stdlib Level (6) is failing due to ballerina-platform/ballerina-library#4405. Will fix that.

[warunalakshitha]

Let's add all deprecated methods to release note. IMO we need to add all abstract classes as breaking change in release note with note saying creating instances of those are not corrected.

[warunalakshitha]

LGTM