prep for release v2.0.0, updated CHANGELOG.md

[yilmazbahadir]

Since the change in the MetadataTransaction.value type is a breaking change and requires small code change in the clients, this release is prepared as a major release(v1.0.3 -> v2.0.0)

• prep for release v2.0.0
• updated CHANGELOG.md

CHANGELOG:

[2.0.0] - 01-Mar-2022

Milestone: Symbol Mainnet

Package	Version	Link
SDK Core	v2.0.0	symbol-sdk
Catbuffer	v1.0.1	catbuffer-typescript
Client Library	v1.0.3	symbol-openapi-typescript-fetch-client

• [BREAKING CHANGE] The type of value field in AccountMetadataTransaction, MosaicMetadataTransaction, NamespaceMetadataTransaction classes is changed from string to Uint8Array.
• fix: Fixed metadata value non-ascii utf8 encoding issue #834
• fix: Upgraded Node to 12.22.1.
• fix: Upgraded typescript to 4.5.4.
• fix: Upgraded RXJS to 7.4.0.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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