Unify IDisposable interfaces

[CraigMacomber]

Description

Unify IDisposable interfaces from @fluidframework/tree and @fluidframework/core-interfaces.

Breaking Changes

Public APIs in @fluidframework/tree now use IDisposable from @fluidframework/core-interfaces replacing disposeSymbol with "dispose".

IDisposable in @fluidframework/core-interfaces is now @sealed indicating that third parties should not implement it to reserve the ability for Fluid Framework to extend it to include Symbol.dispose as a future non-breaking change.

Reviewer Guidance

The review process is outlined on this wiki page.

[msfluid-bot]

⯆ @fluid-example/bundle-size-tests: -28 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	453.27 KB	453.27 KB	■ No change
azureClient.js	552.5 KB	552.5 KB	■ No change
connectionState.js	680 Bytes	680 Bytes	■ No change
containerRuntime.js	256.97 KB	256.97 KB	■ No change
fluidFramework.js	360.48 KB	360.47 KB	⯆ -14 Bytes
loader.js	134.38 KB	134.38 KB	■ No change
map.js	41.46 KB	41.46 KB	■ No change
matrix.js	143.75 KB	143.75 KB	■ No change
odspClient.js	520.87 KB	520.87 KB	■ No change
odspDriver.js	97.3 KB	97.3 KB	■ No change
odspPrefetchSnapshot.js	42.16 KB	42.16 KB	■ No change
sharedString.js	160.27 KB	160.27 KB	■ No change
sharedTree.js	360.46 KB	360.45 KB	⯆ -14 Bytes
Total Size	3.2 MB	3.2 MB	⯆ -28 Bytes

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Baseline commit: e532541

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